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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  
/ sɪnˈsɛrɪtɪ, 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

Related Words

See earnest 1.

Other Word Forms

  • quasi-sincere adjective
  • quasi-sincerely adverb
  • sincerely adverb
  • sincereness noun
  • sincerity noun

Etymology

Origin of sincere

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.