33+ Synonyms for Sincerely Better Words for Emails, Writing, and Honest Expression

Quick Answer

The closest synonyms for sincerely include genuinely, honestly, truly, really, truthfully, earnestly, seriously, and wholeheartedly. Cambridge’s thesaurus lists these as related synonyms.

The best choice depends on the meaning you want:

• Genuinely — emphasizes that something is real or authentic
• Honestly — emphasizes truthfulness
• Truly — emphasizes genuine feeling or belief
• Really — natural and conversational
• Truthfully — focuses on telling the truth
• Earnestly — emphasizes seriousness and sincere intent
• Seriously — emphasizes genuine seriousness
• Wholeheartedly — emphasizes complete support or commitment

For a formal letter closing, however, “Sincerely” has a conventional function and should not automatically be replaced with an ordinary synonym.

Quick Synonym List

1. Genuinely
2. Honestly
3. Truly
4. Really
5. Truthfully
6. Earnestly
7. Seriously
8. Wholeheartedly
9. Authentically
10. Candidly
11. Frankly
12. Openly
13. In good faith
14. In earnest
15. With sincerity
16. With genuine feeling
17. With genuine intent
18. From the heart
19. Heartfelt
20. Deeply
21. Respectfully
22. Cordially
23. Faithfully
24. Yours truly
25. Sincerely yours

Note: Not every item above is a perfect synonym. Some are near synonyms, phrases, or alternatives for the formal sign-off use of “sincerely.”

Closest Synonyms for Sincerely

1. Genuinely

Meaning: In a real, authentic, or heartfelt way.

How it differs: “Genuinely” focuses on whether a feeling, reaction, or intention is real rather than artificial.

Tone: Neutral to professional

Best for: Feelings, appreciation, concern, beliefs, and intentions

Example:

I genuinely appreciate your help.

Usually interchangeable: Yes, when “sincerely” describes a genuine feeling or intention.

2. Honestly

Meaning: Truthfully and without deception.

How it differs: “Honestly” emphasizes truthfulness, while “sincerely” often emphasizes genuine feeling or intention.

Tone: Neutral, conversational

Best for: Opinions, admissions, beliefs, and direct statements

Example:

I honestly believe this is the right choice.

Watch out: “Honestly” can sometimes sound blunt or introduce a difficult opinion.

3. Truly

Meaning: Really, genuinely, or with genuine feeling.

Tone: Neutral to formal

Best for: Appreciation, hope, belief, admiration

Example:

We truly appreciate your support.

Usually interchangeable: Often.

“Truly” can sound especially warm or emphatic.

4. Really

Meaning: In a genuine or actual way; also used for emphasis.

Tone: Conversational

Best for: Everyday speech and informal writing

Example:

I really appreciate your help.

Watch out: “Really” is more casual than “sincerely,” so it may not fit formal writing.

5. Truthfully

Meaning: In accordance with the truth.

Tone: Neutral to formal

Best for: Statements, answers, admissions, and factual honesty

Example:

I can truthfully say that I learned a lot from the experience.

Watch out: “Truthfully” emphasizes truth rather than warmth or emotion.

6. Earnestly

Meaning: In a serious, sincere, and purposeful way.

Tone: Formal

Best for: Requests, appeals, serious intentions, and strong statements

Example:

She earnestly asked him to reconsider.

How it differs: “Earnestly” adds a stronger sense of seriousness.

7. Seriously

Meaning: In a genuine or non-joking way.

Tone: Neutral

Best for: Intentions, commitments, opinions, and serious situations

Example:

He seriously wanted to help.

Watch out: “Seriously” has several meanings, so it is not a universal substitute for “sincerely.”

8. Wholeheartedly

Meaning: With complete commitment, enthusiasm, or feeling.

Tone: Warm, strong

Best for: Support, agreement, commitment, and approval

Example:

I wholeheartedly support your decision.

How it differs: “Wholeheartedly” is often stronger than “sincerely” because it suggests complete commitment.

Formal and Professional Alternatives

In Good Faith

In good faith means acting with honest intentions rather than trying to deceive or take unfair advantage.

The two sides negotiated in good faith.

It is useful in professional and formal contexts, but it is not interchangeable with “sincerely” in every sentence.

With Sincerity

This is a phrase-level alternative.

She accepted the apology with sincerity.

It works when the sentence needs a noun phrase rather than an adverb.

Neutral and Everyday Alternatives

For ordinary communication, these are often the most natural:

• Genuinely
• Honestly
• Truly
• Really
• Seriously
• Openly
• Truthfully

For example:

I sincerely appreciate your help.

could become:

I genuinely appreciate your help.

I truly appreciate your help.

I really appreciate your help.

The meaning remains similar, but the tone changes slightly.

Casual Alternatives

In casual communication, really is often more natural than “sincerely.”

I sincerely appreciate it.

→ I really appreciate it.

Other casual possibilities include:

• Really
• Honestly
• From the heart
• For real

“For real” is highly conversational and should generally be avoided in formal or professional writing.

Sincerely vs. Near Synonyms

Sincerely vs. Genuinely

Both can describe feelings or intentions that are real.

I sincerely care about the project.

I genuinely care about the project.

“Genuinely” puts slightly more emphasis on authenticity.

Sincerely vs. Honestly

I sincerely apologize.

This emphasizes genuine regret.

Honestly, I don’t know what happened.

This emphasizes truthful admission.

So “honestly” is a useful alternative in some contexts, but it is not a perfect replacement.

Sincerely vs. Truly

I sincerely appreciate your support.

I truly appreciate your support.

Both sound natural. “Truly” can add a warm or emphatic quality.

Sincerely vs. Earnestly

She sincerely asked for another chance.

She earnestly asked for another chance.

“Earnestly” makes the request sound more serious and purposeful.

Sincerely vs. Wholeheartedly

I sincerely support the plan.

I wholeheartedly support the plan.

“Wholeheartedly” suggests complete and enthusiastic support, making it stronger.

Sincerely vs. Seriously

I sincerely want to help.

I seriously want to help.

The first emphasizes genuine intention. The second can emphasize that the speaker is serious rather than joking or casually suggesting something.

Comparison Table

How to Choose the Right Alternative

Choose genuinely for authentic feelings

She genuinely appreciated the opportunity.

Choose honestly for truthful statements

Honestly, I didn’t expect that result.

Choose truly for warm emphasis

We truly value your contribution.

Choose really for casual communication

I really appreciate your help.

Choose truthfully when accuracy and honesty matter

I can truthfully say that I tried my best.

Choose earnestly for serious intentions

He earnestly requested another opportunity.

Choose wholeheartedly for complete support

I wholeheartedly agree with your recommendation.

Choose in good faith for honest intentions

They negotiated in good faith.

Keep sincerely when it already expresses the meaning clearly

I sincerely apologize for the misunderstanding.

Sentence Transformations

1. Apology

Original:

I sincerely apologize for the mistake.

Alternative:

I genuinely apologize for the mistake.

Difference: “Genuinely” emphasizes authentic regret.

2. Appreciation

Original:

We sincerely appreciate your support.

Alternative:

We truly appreciate your support.

Difference: “Truly” adds warm emphasis.

3. Belief

Original:

I sincerely believe this approach will work.

Alternative:

I genuinely believe this approach will work.

Difference: “Genuinely” emphasizes authentic belief.

4. Hope

Original:

I sincerely hope everything goes well.

Alternative:

I truly hope everything goes well.

Difference: “Truly” sounds warm and heartfelt.

5. Support

Original:

I sincerely support your decision.

Alternative:

I wholeheartedly support your decision.

Difference: “Wholeheartedly” expresses stronger, more complete support.

6. Request

Original:

She sincerely asked for another opportunity.

Alternative:

She earnestly asked for another opportunity.

Difference: “Earnestly” emphasizes seriousness.

7. Admission

Original:

I sincerely don’t know what happened.

Alternative:

I honestly don’t know what happened.

Difference: “Honestly” emphasizes truthfulness.

8. Intention

Original:

They sincerely wanted to help.

Alternative:

They genuinely wanted to help.

Difference: “Genuinely” emphasizes that their desire was real.

Grammar and Usage

Sincerely is an adverb. It describes the manner in which someone expresses a feeling, belief, intention, or action.

Common combinations include:

• sincerely apologize
• sincerely appreciate
• sincerely believe
• sincerely hope
• sincerely regret
• sincerely thank
• sincerely want
• sincerely wish
• sincerely care

Examples:

I sincerely apologize for the confusion.

We sincerely appreciate your patience.

She sincerely believed she was helping.

I sincerely hope everything works out.

Cambridge defines the adverb as meaning honestly and without pretending or lying.

Sincerely as a Formal Sign-Off

“Sincerely” also has a separate use at the end of a formal letter or email.

Sincerely,
Jordan Lee

In American English, “Sincerely” and “Sincerely yours” are established formal closings.

This meaning is different from the adverbial use, so words such as “genuinely” or “honestly” should not simply replace it.

Common Mistakes

1. Treating every synonym as identical

“Honestly,” “genuinely,” “truly,” and “earnestly” overlap with “sincerely,” but each emphasizes something different.

Choose according to meaning rather than simply replacing one word with another.

2. Using “honestly” when you mean “genuinely”

I honestly appreciate your help.

This can work, but:

I genuinely appreciate your help.

more clearly emphasizes real appreciation.

3. Overusing “wholeheartedly”

“Wholeheartedly” suggests complete commitment.

I wholeheartedly support the proposal.

This is stronger than:

I sincerely support the proposal.

4. Using “seriously” everywhere

“Seriously” can refer to seriousness, intensity, or a lack of joking. It is therefore not a universal replacement for “sincerely.”

5. Using “frankly” as a synonym for “sincerely”

“Frankly” means directly or openly.

Frankly, I disagree.

This can sound blunt and does not necessarily communicate warmth or genuine emotion.

6. Replacing “Sincerely” in a formal sign-off

This would usually sound unnatural:

Genuinely,
Alex

A conventional closing is:

Sincerely,
Alex

7. Misspelling “sincerely”

Common misspellings include sincerly, sincerley, and sinserely.

The correct spelling is:

sincerely

Commonly Confused Words

Sincerely vs. Respectfully

Sincerely expresses genuine feeling or intention.

Respectfully expresses respect, especially in formal communication.

I sincerely appreciate your help.

I respectfully disagree.

These words are not interchangeable in these sentences.

Sincerely vs. Cordially

Cordially means warmly and politely.

It can be used in formal correspondence, but it does not have exactly the same meaning as “sincerely.”

Sincerely vs. Faithfully

Faithfully can express loyalty or commitment and is also used in some formal letter closings. It should not automatically be treated as a direct synonym for “sincerely.”

When Not to Use an Alternative

Sometimes sincerely is already the clearest choice.

Keep sincerely when:

• You are expressing genuine regret.
• You are emphasizing authentic appreciation.
• You are expressing a genuine belief.
• You are describing a sincere intention.
• You are writing a formal letter or email.
• A replacement would change the meaning.
• The original sentence already sounds natural.

For example:

I sincerely apologize for the inconvenience.

Replacing “sincerely” with “frankly” would change the meaning and tone.

Likewise:

Sincerely,
Taylor

does not need to be replaced simply to avoid repetition.

Writing Tips

Match the alternative to the intended meaning

• Genuinely → authenticity
• Honestly → truthfulness
• Truly → genuine feeling or emphasis
• Really → casual emphasis
• Truthfully → factual honesty
• Earnestly → seriousness
• Wholeheartedly → complete commitment
• Frankly → directness
• Candidly → openness
• In good faith → honest intentions

Match the tone to the audience

Professional:

We sincerely appreciate your feedback.

Casual:

We really appreciate your feedback.

Both express appreciation, but the second is more conversational.

Don’t change the word just to sound sophisticated

A less common synonym is not automatically better. If sincerely is the clearest and most natural choice, keep it.

FAQs

1. What is the closest synonym for “sincerely”?

The closest common alternatives are genuinely, honestly, truly, really, truthfully, earnestly, seriously, and wholeheartedly. The best option depends on whether you want to emphasize authenticity, truthfulness, seriousness, or complete commitment.

2. What is a professional synonym for “sincerely”?

Genuinely, truly, earnestly, truthfully, and wholeheartedly can work in professional writing when their specific meanings fit. However, “sincerely” is already appropriate for many professional contexts.

3. Is “genuinely” the same as “sincerely”?

They are very close but not identical. Genuinely emphasizes that something is real or authentic, while sincerely often emphasizes genuine feeling, intention, or belief.

4. Is “honestly” a synonym for “sincerely”?

Sometimes. Honestly focuses on truthfulness, while sincerely can focus on genuine feeling or intention. They overlap but cannot replace each other in every sentence.

5. What is a simple synonym for “sincerely”?

Really, honestly, truly, and genuinely are simple alternatives. “Really” is the most conversational of these choices.

6. Can “Sincerely” be used at the end of an email?

Yes. “Sincerely” is a conventional formal closing for letters and emails, particularly when writing to someone in a professional or formal context.

7. What is the opposite of “sincerely”?

Common opposites include insincerely, falsely, dishonestly, deceptively, and untruthfully. These describe communication that lacks genuine or truthful intent.

Editor’s Choice

For general writing, these five alternatives cover the most useful distinctions:

• Genuinely — authentic feelings or intentions
• Honestly — truthful statements
• Truly — warm or emphatic expressions
• Earnestly — serious intentions
• Wholeheartedly — complete support or commitment

These are not ranked; each works best in a different context.

Key Takeaways

• Sincerely usually means genuinely, honestly, and without pretending.
• Genuinely, honestly, truly, and really are common alternatives, but their nuances differ.
• Truthfully emphasizes honesty, while earnestly emphasizes seriousness.
• Wholeheartedly is stronger and suggests complete commitment or support.
• Sincerely is also a conventional formal letter and email closing, so ordinary synonyms should not automatically replace it.

Internal Link Opportunities

1. Synonyms for honest — connects naturally with “honestly.”
2. Synonyms for genuine — supports the distinction between genuine and sincere.
3. Synonyms for truly — expands vocabulary around genuine emphasis.
4. Synonyms for heartfelt — covers emotional expressions related to sincerity.
5. Synonyms for respectful — useful for comparing formal communication terms.
6. Synonyms for appreciate — connects with phrases such as “sincerely appreciate.”
7. Formal email sign-offs — supports the letter-closing use of “Sincerely.”
8. Words for honesty and integrity — builds a broader vocabulary cluster around sincerity.