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[sin-seer] /sɪnˈsɪər/
adjective, sincerer, sincerest.
free of deceit, hypocrisy, or falseness; earnest:
a sincere apology.
genuine; real:
a sincere effort to improve; a sincere friend.
pure; unmixed; unadulterated.
Obsolete. sound; unimpaired.
Origin of sincere
1525-35; < Latin sincērus pure, clean, untainted
Related forms
sincerely, adverb
sincereness, noun
quasi-sincere, adjective
quasi-sincerely, adverb
1. frank, candid, honest, open, guileless; unaffected. See earnest1 .
1, 2. false. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for sincerest
Contemporary Examples
Historical Examples
  • The Christian fervour of the artists led them to give their best and sincerest work to the decoration of them.

    The Story of Nuremberg Cecil Headlam
  • The sincerest of women will make no unnecessary confidences to a man.

    Chance Joseph Conrad
  • For Death is near him and Death is the sincerest and most authentic of inspirers.

    Children of the Market Place Edgar Lee Masters
  • This can only be done by a writer of feeling, of imagination, and of the sincerest art.

    Peak and Prairie Anna Fuller
  • Latterly he took to a teasing process of collaboration, which his sincerest admirers could have willingly spared.

    The English Novel George Saintsbury
British Dictionary definitions for sincerest


not hypocritical or deceitful; open; genuine: a sincere person, sincere regret
(archaic) pure; unadulterated; unmixed
(obsolete) sound; whole
Derived Forms
sincerely, adverb
sincerity (sɪnˈsɛrɪtɪ), sincereness, noun
Word Origin
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
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Word Origin and History for sincerest



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).

Online Etymology Dictionary, © 2010 Douglas Harper
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