If you have ever written a sentence such as “Most importantly, we need to stay focused” and wondered whether it should actually be “Most important, we need to stay focused,” you are not alone.
The two expressions look almost identical, sound natural in many of the same situations, and are both widely used in modern English.
That makes most importantly or most important a surprisingly common grammar and style question.
The good news is that you do not have to memorize a complicated rule. In most cases, most importantly is the traditional adverbial form used to introduce or emphasize an important point, while most important is an adjective phrase that can describe a noun or work as a shortened construction in certain sentences.
Both can be correct, but they do not function in exactly the same way.
The difference becomes especially useful in formal writing, academic essays, business emails, speeches, articles, and everyday conversation.
Choosing the right form can make your sentence clearer and help you avoid an awkward construction.
In this guide, you will learn most importantly vs. most important, how each phrase works grammatically, when native speakers use them, whether one is more formal, how punctuation affects the sentence, common mistakes, and more than 20 real-life examples.
Quick Answer
Most importantly is an adverbial phrase and is usually the better choice when you mean “above all,” “more than anything else,” or “in the most important way.”
Most important is an adjective phrase. It normally describes a noun, as in “the most important decision.” However, it can also appear in shortened or linking-verb constructions, such as “What is most important is honesty.”
Quick rule
- Most importantly → modifies or comments on the action or whole sentence.
- Most important → describes a person, thing, idea, quality, or situation.
- Both can be correct, but they are not interchangeable in every sentence.
Tip: If you are introducing your final or strongest point, “Most importantly,” is usually the safest choice.
Most Importantly vs. Most Important: Comparison Table
| Feature | Most Importantly | Most Important |
|---|---|---|
| Basic form | Adverbial phrase | Adjective phrase |
| Main function | Emphasizes a point or action | Describes something as having the highest importance |
| Meaning | Above all; in the most important respect | Having the greatest importance |
| Typical position | Often at the beginning of a sentence | Usually before a noun or after a linking verb |
| Example | Most importantly, stay calm. | Safety is most important. |
| Common use | Transitions and emphasis | Descriptions and comparisons |
| Formal writing | Very common | Very common |
| Conversation | Very common | Very common |
| Can introduce a sentence? | Yes | Sometimes, depending on construction |
| Modifies a noun? | No | Yes |
| Common phrase | Most importantly, remember… | The most important point… |
| Common mistake | Using it when an adjective is needed | Using it as an adverbial sentence opener in formal writing |
| US English | Standard | Standard |
| UK English | Standard | Standard |
| Safest use | Sentence-level emphasis | Describing importance |
What Does “Most Importantly” Mean?
Most importantly means “above all,” “more importantly than anything else,” or “in the most important respect.”
It is built from the adjective important and the adverbial ending -ly:
important → importantly → most importantly
The phrase is commonly used to highlight the point that the writer or speaker considers the highest priority.
Examples
- Most importantly, everyone arrived safely.
- Most importantly, we need to protect the children.
- Most importantly, the evidence supports the conclusion.
- Most importantly, don’t give up.
In each example, most importantly does not describe a particular noun. Instead, it signals the importance of the entire following statement.
Why is “-ly” used?
The ending -ly often creates an adverb from an adjective:
- careful → carefully
- clear → clearly
- serious → seriously
- important → importantly
An adverb can describe how something happens or can comment on a whole statement.
That is why most importantly is especially natural when it introduces a sentence.
Pronunciation
Most importantly is generally pronounced approximately as:
mohst im-POR-tənt-lee
The exact pronunciation can vary slightly by accent.
“Most importantly” in everyday English
You will hear this expression frequently in conversation:
“We can fix the schedule later. Most importantly, everyone is okay.”
Here, the speaker is telling the listener what matters more than the other details.
It is useful for:
- emphasizing priorities
- introducing a final point
- highlighting a key fact
- summarizing an important consideration
- moving from minor details to the main issue
When Should You Use “Most Importantly”?
Use most importantly when you want to say “above all” or draw attention to the most significant point.
1. To introduce a key point
Most importantly, we need to be honest with our customers.
The phrase tells the reader that honesty is the highest priority.
2. To emphasize an action
Most importantly, remember to save your work.
Here, the phrase emphasizes the importance of the action remember to save your work.
3. To conclude a list of priorities
We need better communication, stronger planning, and, most importantly, consistent follow-through.
This construction is extremely common in professional writing.
4. To highlight the central idea
The project is expensive and time-consuming, but most importantly, it must be safe.
The phrase signals that safety matters more than the other considerations.
5. In speeches
Most importantly, I want to thank everyone who supported this project.
It sounds natural because the speaker is emphasizing the importance of the following thought.
What Does “Most Important” Mean?
Most important is an adjective phrase meaning “having the greatest importance” or “more important than all the others.”
Unlike most importantly, it normally describes a noun or follows a linking verb.
Consider:
This is the most important decision we have made.
Here, most important describes decision.
Another example:
Your safety is most important.
Here, most important describes your safety through the linking verb is.
Examples
- This is the most important lesson.
- Family is most important to her.
- The most important factor is timing.
- What is most important is that everyone understands the plan.
The grammatical structure
The basic adjective pattern is:
the + most important + noun
For example:
- the most important issue
- the most important reason
- the most important decision
- the most important question
- the most important skill
Without the, most important can also follow a linking verb:
Trust is most important.
The phrase is functioning as a subject complement.
When Should You Use “Most Important”?
Use most important when you are directly describing something as having the highest level of importance.
1. Before a noun
This is the most important requirement.
Here, important describes requirement.
2. After a linking verb
Your health is most important.
The phrase describes the subject your health.
3. With “what”
One particularly useful structure is:
What is most important is…
For example:
What is most important is that we learn from the experience.
This means:
The thing that matters most is that we learn from the experience.
4. In comparisons
The most important factor is cost.
The phrase identifies the factor with the greatest importance among several factors.
5. In definitions and explanations
The most important difference is the meaning.
This is a straightforward adjective construction.
Most Importantly or Most Important: The Key Difference
The simplest way to understand the difference is to ask:
What is the phrase doing in the sentence?
If it is emphasizing the statement that follows, use most importantly.
If it is describing a noun or identifying something as having the greatest importance, use most important.
Compare these sentences
Most importantly, check the final figures.
The phrase introduces an important instruction.
The final figures are the most important part of the report.
The phrase describes part.
That is the central grammatical distinction.
Another comparison
Most importantly, we need to protect customer data.
versus:
Protecting customer data is most important.
Both sentences communicate a similar idea, but their structures are different.
The first uses an adverbial expression to emphasize the statement.
The second uses an adjective phrase to describe the importance of the subject.
Is “Most Importantly” Grammatically Correct?
Yes. Most importantly is grammatically correct and widely accepted in standard English.
Some writers occasionally criticize most importantly because they prefer the shorter adjective construction most important, especially in phrases such as:
Most important, we need to act now.
However, most importantly has a long-established role in English as an adverbial form. It is not simply a modern mistake.
The phrase is particularly natural when it means:
Above all
For example:
Most importantly, we must remain calm.
You could replace it with:
Above all, we must remain calm.
The meaning remains essentially the same.
A useful distinction
Do not assume that every word ending in -ly is automatically better or more formal.
Instead, choose the form based on its grammatical role.
Most importantly and most important can both be correct because they perform different jobs.
Is “Most Important” Correct at the Beginning of a Sentence?
Yes, but context matters.
Consider:
Most important, we need to protect the environment.
This construction can be found in edited English and is understandable. It treats most important as a shortened adverbial phrase.
However, many writers will find:
Most importantly, we need to protect the environment.
more natural and immediately recognizable as a sentence-opening adverbial.
There is another beginning-of-sentence construction where most important is completely natural:
Most important is the need for accurate information.
This is an inverted structure. It is more formal and less conversational.
A more ordinary version would be:
The need for accurate information is most important.
Why Do People Confuse “Most Important” and “Most Importantly”?
There are several reasons.
1. They have the same root
Both forms come from important, so they naturally look and sound similar.
2. Their meanings overlap
Both can express the idea of high priority.
Compare:
Most importantly, listen carefully.
and:
Listening carefully is most important.
The overall message is similar even though the grammar differs.
3. “Most important” can appear in shortened constructions
English often allows words or phrases to be omitted when the meaning remains clear.
That is why you may see:
Most important, stay focused.
alongside:
Most importantly, stay focused.
4. Different writing traditions favor different forms
Some editors prefer concise constructions, while others prefer the explicit adverbial form when an adverb is needed.
This is partly a matter of style rather than a simple correct/incorrect rule.
Grammar: Adjective vs. Adverb
Understanding the parts of speech makes this distinction much easier.
“Important” is an adjective
An adjective describes a noun or pronoun.
Examples:
- an important decision
- an important question
- an important person
- the decision is important
The adjective can be modified by most:
the most important decision
“Importantly” is an adverb
Importantly can modify an action or comment on a statement.
Example:
Most importantly, follow the instructions.
It is not describing the noun instructions. Instead, it emphasizes the importance of the instruction that follows.
Compare the structures
Adjective:
This is the most important rule.
Adverbial phrase:
Most importantly, follow this rule.
The first describes rule.
The second introduces or emphasizes the instruction.
Does “Most Importantly” Mean “In the Most Important Way”?
Sometimes, yes, but in everyday modern English it often functions more naturally as a sentence-level marker meaning “above all.”
For example:
Most importantly, she treated everyone with respect.
The phrase does not necessarily describe the manner in which she treated people. It tells us that this point is the most significant one.
This is why calling most importantly simply “the adverb of important” does not tell the whole story. Its practical use is broader than a basic adjective-to-adverb conversion.
Is “Most Importantly” More Formal Than “Most Important”?
Neither is automatically more formal.
Both occur in:
- academic writing
- business writing
- journalism
- professional communication
- speeches
- everyday conversation
The difference is primarily grammatical and stylistic, not a simple formal-versus-informal distinction.
Professional writing
Most importantly, the report must be supported by reliable evidence.
Natural and professional.
Academic writing
Most importantly, these findings suggest that the original assumption requires further investigation.
Also natural.
Everyday conversation
Most importantly, are you okay?
Natural in speech, although “Most important, are you okay?” may sound less conversational to many readers.
“Most Important” vs. “The Most Important”
This is another distinction worth learning.
Most important
Your safety is most important.
This describes safety as having the highest importance.
The most important
Your safety is the most important consideration.
Here, the most important modifies the noun consideration.
The article the is commonly used when you identify one item as the highest in a group or category.
Compare:
This issue is most important.
This is the most important issue.
Both are grammatical, but the structures are different.
20+ Real-Life Examples
The easiest way to understand the difference is to see how native English writers and speakers use these forms in different settings.
Everyday Conversation
- Most importantly, don’t forget your passport.
- Most importantly, everyone got home safely.
- Your family is most important, so take the time you need.
- What is most important to me is having honest conversations.
Business Writing
- Most importantly, the company must protect customer information.
- The most important issue is the project’s final deadline.
- Most importantly, the new policy should be easy for employees to understand.
- The most important factor in our decision was long-term reliability.
Professional Email
- Most importantly, please let me know if you need additional information.
- The most important point to remember is that the deadline has not changed.
- Most importantly, we appreciate your patience during the transition.
Academic Writing
- Most importantly, the findings provide evidence for the proposed theory.
- The most important limitation of the study is its small sample size.
- What is most important is the relationship between the two variables.
- Most importantly, the results should be interpreted within their historical context.
School Writing
- Most importantly, students should understand why the rule exists.
- The most important lesson I learned was the value of preparation.
- What is most important is that every student gets a fair opportunity.
Social Media
- Most importantly, keep being yourself.
- Good friends are most important when life gets difficult.
- Most importantly: enjoy the journey!
Text Messages
- Most importantly, are you okay?
- The most important thing is that you’re safe.
- Most importantly, call me when you arrive.
Formal Reports
- Most importantly, the evidence does not support the original conclusion.
- The most important finding concerns the long-term effects of the policy.
These examples demonstrate a useful pattern: most importantly frequently introduces or emphasizes an entire idea, while most important commonly describes a noun or follows a linking verb.
Common Mistakes With “Most Importantly” and “Most Important”
Mistake 1: Treating them as completely interchangeable
Incorrect approach:
“They mean exactly the same thing, so either one works everywhere.”
That is not quite right.
They overlap in meaning, but their grammatical functions differ.
Better approach:
Ask whether you are emphasizing a statement or describing something.
Mistake 2: Using “most important” before a verb without a clear structure
A sentence such as:
Most important, remember to check the door.
is understandable, but some readers may prefer:
Most importantly, remember to check the door.
The adverbial form clearly signals that the phrase modifies the following instruction.
Mistake 3: Assuming “most importantly” is incorrect
Some grammar discussions claim that most important must always be used and most importantly should be avoided.
That is an oversimplification.
Most importantly is an established and widely used English expression.
Mistake 4: Confusing “most important” with “the most important”
Compare:
Safety is most important.
and:
Safety is the most important concern.
The first uses most important as a complement.
The second uses the most important as a noun modifier.
Mistake 5: Overusing “most importantly”
Because it is a useful transition, writers sometimes use it repeatedly:
Most importantly, we need better planning. Most importantly, we need better communication. Most importantly, we need more staff.
This quickly becomes repetitive.
Better alternative
Vary your transitions:
- Above all,
- More importantly,
- Most significantly,
- The key point is…
- Above everything else,
- The main concern is…
- What matters most is…
Choose the expression that accurately reflects your meaning.
“Most Importantly” vs. “More Importantly”
These phrases are related but not identical.
Most importantly
Means approximately:
Above all / of greatest importance
Example:
Most importantly, the patient needs immediate attention.
More importantly
Means approximately:
Of greater importance than the point just mentioned
Example:
The plan is affordable. More importantly, it is sustainable.
The second statement is being presented as more important than the first.
Easy comparison
Most importantly = the highest priority.
More importantly = a higher priority than something previously mentioned.
This distinction is useful in essays, reports, and persuasive writing.
“Most Important” vs. “Most Importantly” in Academic Writing
Both forms can be appropriate in academic English.
However, academic writers should avoid relying too heavily on transitional phrases.
Instead of:
Most importantly, this study proves…
consider whether the sentence can make the evidence itself clear:
The strongest evidence comes from the long-term results.
This is often more precise.
Use “most importantly” when emphasis is genuinely useful
Most importantly, the results remained consistent across all three groups.
Use “most important” when describing a finding
The most important finding was the consistency of the results.
Both are useful, but they do different grammatical jobs.
Style Guide Considerations
Major English dictionaries and style resources recognize the normal adjective/adverb distinction and the established use of importantly.
The practical issue for professional editors is usually not whether most importantly exists. It does. The more useful question is whether the phrase improves the sentence.
Good editing asks:
- Is the phrase grammatically appropriate?
- Does it express the intended relationship?
- Is it necessary?
- Does it sound natural in the context?
- Would a more precise expression be better?
This is a better approach than treating one form as universally correct.
A note on style preferences
Different style guides and individual editors may prefer concise wording in some contexts. A formal publication may also have its own house style.
Therefore, if you are writing for:
- a university
- a journal
- a company
- a newspaper
- a government organization
follow its specific editorial guidelines when they exist.
But in ordinary standard English, most importantly is not a grammatical error.
US English vs. UK English
There is no major American-versus-British English distinction here.
Both most importantly and most important are used in American and British English.
You do not need to switch between them simply because your audience is in the United States or United Kingdom.
The choice depends on sentence structure and style, not nationality.
Punctuation With “Most Importantly”
When most importantly appears at the beginning of a sentence as an introductory phrase, a comma is usually appropriate:
Most importantly, we need accurate information.
When it appears inside a sentence, commas can be used to set off the parenthetical phrase:
We need accurate information, most importantly, before making a decision.
But punctuation depends on the exact construction.
At the beginning
Most importantly, check the figures.
In the middle
We need to check the figures and, most importantly, verify the source.
At the end
We need to protect the data, most importantly.
The final version can sound less natural than placing the phrase earlier, so sentence rhythm matters.
Can You Say “Most Important, …”?
Yes, but be careful.
You may encounter:
Most important, we must act quickly.
This is a legitimate construction in English, especially in concise or formal prose.
However, if you want the clearest and most familiar sentence-opening expression, most importantly is generally the safer choice:
Most importantly, we must act quickly.
The adjective form becomes especially natural when it directly modifies a noun:
The most important step is to act quickly.
Or follows a linking verb:
Acting quickly is most important.
Memory Tricks
Here are several simple ways to remember the difference.
Trick 1: “-ly” points to the whole idea
Think:
Most importantly = “Above all…”
If you can replace the phrase with above all, most importantly is probably the right choice.
Most importantly, stay calm.
Above all, stay calm.
Both work naturally.
Trick 2: “Important” likes nouns
When important describes a noun, use the adjective:
the most important decision
the most important reason
the most important lesson
Trick 3: Ask “What does it describe?”
If it describes a thing, think most important.
If it emphasizes an action or whole statement, think most importantly.
Trick 4: Remember the “thing test”
The most important thing is honesty.
Here, important describes thing.
But:
Most importantly, be honest.
Here, the phrase emphasizes the instruction.
A Simple Decision Guide
When you are unsure, follow these steps.
Step 1: Look at what comes next
If a noun follows:
the most important point
the most important factor
the most important reason
Use most important.
Step 2: If you are introducing an instruction or statement
Try:
Most importantly, …
For example:
Most importantly, check your work.
Step 3: Try replacing it with “above all”
If the sentence still makes sense:
Above all, check your work.
then most importantly is a strong choice.
Step 4: Consider whether you are describing importance
If your sentence has a structure such as:
X is most important
then the adjective form is appropriate.
Accuracy is most important.
Quick Reference Examples
| If you mean… | Use | Example |
|---|---|---|
| Above all | Most importantly | Most importantly, stay safe. |
| The highest-priority action | Most importantly | Most importantly, back up the files. |
| The highest-priority thing | Most important | Safety is most important. |
| A noun with the highest importance | Most important | This is the most important step. |
| The main factor | Most important | The most important factor is cost. |
| The key idea in a sentence | Most importantly | Most importantly, we need evidence. |
| A subject complement | Most important | Trust is most important. |
| A sentence transition | Most importantly | Most importantly, be honest. |
Frequently Asked Questions
Is “most importantly” grammatically correct?
Yes. Most importantly is grammatically correct and widely used in standard English, particularly when it means “above all” or emphasizes the importance of the following statement.
Is “most important” or “most importantly” correct?
Both can be correct. Use most important when it functions as an adjective, especially before a noun or after a linking verb. Use most importantly when it functions as an adverbial expression that emphasizes a statement or action.
Should I say “most important” or “most importantly” at the beginning of a sentence?
Both forms can occur, but most importantly is usually the clearest and most familiar choice when you mean “above all.”
Most importantly, follow the instructions.
Is “most importantly” formal English?
Yes. Most importantly is acceptable in formal, professional, academic, and everyday English. However, formal writing should use it purposefully rather than as a repetitive transition.
Is “most importantly” better than “most important”?
Not always. They have different grammatical functions. Most importantly is usually better for sentence-level emphasis, while most important is better for describing a noun or subject.
Can I start a sentence with “most important”?
Yes. For example:
Most important, we must protect the evidence.
However, most importantly is often more natural in this particular sentence-opening role.
What is the difference between “more importantly” and “most importantly”?
More importantly introduces something that is more important than a previously mentioned point. Most importantly introduces or identifies the highest-priority point.
The plan is affordable. More importantly, it is safe.
Most importantly, everyone is safe.
Is “most importantly” American or British English?
It is used in both American and British English. There is no important regional rule requiring one form over the other.
Is “most importantly” a sentence adverb?
It can function as an adverbial sentence-level modifier, especially when it comments on or emphasizes the proposition that follows.
Most importantly, the evidence is reliable.
Final Verdict: Most Importantly or Most Important?
So, most importantly or most important—which should you use?
The answer is both, but choose based on grammar and context.
Use most importantly when:
- you mean “above all”
- you are emphasizing a complete statement
- you are introducing an important instruction
- you are highlighting the highest priority
- you are using it as an introductory or sentence-level adverbial
Example:
Most importantly, we need to protect the people involved.
Use most important when:
- it directly describes a noun
- it follows a linking verb
- you are identifying the thing with the greatest importance
- you use a structure such as “the most important + noun”
- you are saying that something has the highest priority
Examples:
This is the most important decision.
Safety is most important.
The most important factor is reliability.
The easiest rule to remember
Most importantly = above all.
Most important = having the greatest importance.
If you are opening a sentence to emphasize your strongest point, “Most importantly, …” is usually the natural choice.
If you are describing a noun, choose “the most important…”
And if you are saying that something itself has the highest priority, “is most important” works well.
Bottom line
There is no need to declare one phrase the universal winner. Most importantly and most important are both legitimate English expressions. The real difference is their grammatical function.
When in doubt, ask one simple question:
Am I emphasizing the statement, or am I describing something?
- Emphasizing the statement → Most importantly
- Describing something → Most important
That small distinction will help you choose the form that sounds clear, natural, and polished in everything from casual conversation to academic and professional writing.
Elon Parker is a dedicated writer at Wordscrowd, creating clear, informative, and engaging content for readers.
With a focus on useful information, Elon aims to make every article simple, reliable, and easy to understand.
