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adjective, sin·cer·er, sin·cer·est.
  1. free of deceit, hypocrisy, or falseness; earnest: a sincere apology.
  2. genuine; real: a sincere effort to improve; a sincere friend.
  3. pure; unmixed; unadulterated.
  4. Obsolete. sound; unimpaired.
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Origin of sincere

First recorded in 1525–35, sincere is from the Latin word sincērus pure, clean, untainted
Related formssin·cere·ly, adverbsin·cere·ness, nounqua·si-sin·cere, adjectivequa·si-sin·cere·ly, adverb

Synonyms for sincere

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Antonyms for sincere

1, 2. false.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for sincere

real, genuine, heartfelt, outspoken, trustworthy, earnest, candid, serious, forthright, true, aboveboard, actual, artless, dear, devout, faithful, frank, guileless, natural, no-nonsense

Examples from the Web for sincere

Contemporary Examples of sincere

Historical Examples of sincere

British Dictionary definitions for sincere


  1. not hypocritical or deceitful; open; genuinea sincere person; sincere regret
  2. archaic pure; unadulterated; unmixed
  3. obsolete sound; whole
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Derived Formssincerely, adverbsincerity (sɪnˈsɛrɪtɪ) or sincereness, noun

Word Origin for sincere

C16: from Latin sincērus
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

Word Origin and History for sincere


1530s, "pure, unmixed," from Middle French sincere (16c.), from Latin sincerus, of things, "whole, clean, pure, uninjured, unmixed," figuratively "sound, genuine, pure, true, candid, truthful," of uncertain origin. Ground sense seems to be "that which is not falsified." Meaning "free from pretense or falsehood" in English is from 1530s.

There has been a temptation to see the first element as Latin sine "without." But there is no etymological justification for the common story that the word means "without wax" (*sin cerae), which is dismissed out of hand by OED and others, and the stories invented to justify that folk etymology are even less plausible. Watkins has it as originally "of one growth" (i.e. "not hybrid, unmixed"), from PIE *sm-ke-ro-, from *sem- "one" (see same) + root of crescere "to grow" (see crescent).

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Online Etymology Dictionary, © 2010 Douglas Harper