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Synonyms

sincere

American  
[sin-seer] / sɪnˈsɪər /

adjective

sincerer, sincerest
  1. free of deceit, hypocrisy, or falseness; earnest.

    a sincere apology.

    Synonyms:
    unaffected, guileless, open, honest, candid, frank
    Antonyms:
    false
  2. genuine; real.

    a sincere effort to improve; a sincere friend.

    Antonyms:
    false
  3. pure; unmixed; unadulterated.

  4. Obsolete. sound; unimpaired.


sincere British  
/ sɪnˈsɪə /

adjective

  1. not hypocritical or deceitful; open; genuine

    a sincere person

    sincere regret

  2. archaic pure; unadulterated; unmixed

  3. obsolete sound; whole

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Synonym Usage

See earnest 1.

Other Word Forms

Etymology

Origin of sincere

First recorded in 1525–35; from Latin sincērus “pure, clean, untainted”

Explanation

Being sincere is being genuine. If someone compliments you on your outfit, but you notice them rolling their eyes when they think you’re not looking, they probably weren't being sincere. If you've been offered a sincere thanks for something you've done, the person is probably really grateful. Sometimes when people say "thank you," they don't always mean it, but when they add the adjective sincere, the emphasis is usually for a very good reason. You may hear a charity sending out a sincere thanks to sponsors for their donations, which help keep the charity running.

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Vocabulary lists containing sincere

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“This has been a very difficult time for everybody associated with the Clippers, and for that, I have sincere regrets,” Ballmer’s statement read.

From Los Angeles Times Sep. 14, 2026

Maybe Vance’s just-asking-questions routine is a sincere effort to fix that.

From Slate Sep. 11, 2026

“He didn’t say he hated Trump,” interjected his wife Lila Trask, 79, who thinks the teacher is sincere.

From The Wall Street Journal Sep. 10, 2026

"Both Mr Kushner and Mr Witkoff are always welcome guests here, and we are glad to work with them," he said, describing them as "sincere".

From Barron's Sep. 2, 2026

But the look of concern on his face is sincere.

From "Popcorn" by Rob Harrell

“There is no sincerer love than the love of food,” reads the slip of paper.

From Washington Post Apr. 21, 2015

Guarantee us peace," begged Mr. Guinness, "and Germany will find she has no sincerer and no more useful friend in the world than Britain!

From Time Magazine Archive

Another Richmond editorial said, “There will in all the earth be no sincerer mourners than the people of the southern section of this Union.”

From "Ambushed!" by Gail Jarrow

And the Great Mother probably never had purer or sincerer devotees.

From Roman Society from Nero to Marcus Aurelius by Samuel Dill

Never did poet have a truer companion, a sincerer spiritual helpmate, than Mr. Bryant in his wife.

From Home Life of Great Authors by Hattie Tyng Griswold

“Skydive Perris offers its sincerest condolences to the individual’s family and politely asks for privacy as we mourn together as a community,” according to the statement.

From Los Angeles Times Jun. 2, 2026

"What happened today in Teotihuacan hurts us deeply. I express my sincerest solidarity to the people affected and their families," Sheinbaum wrote.

From Barron's Apr. 20, 2026

"My sincerest and heartfelt condolences continue to remain with the families of both teenagers through this unimaginably difficult time," he added.

From BBC Feb. 21, 2026

If imitation truly is the sincerest form of flattery, perhaps Americans should take a bow.

From The Wall Street Journal Feb. 12, 2026

“Mrs. Jackson, again, my sincerest apologies that we haven’t spoken before today.”

From "On the Come Up" by Angie Thomas

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