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Definition of "unfaithful" []

  • Not adhering to promises, obligations, or allegiances; disloyal. See Synonyms at faithless. (adjective)
  • Not true or constant to one's sexual partner. (adjective)
  • Not true to one's spouse; guilty of adultery. (adjective)
  • Not justly representing or reflecting the original; inaccurate. (adjective)
  • Obsolete Deficient in or lacking religious faith; unbelieving. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "unfaithful" in a sentence
  • "Of course the term unfaithful isn't quite accurate."
  • "This, however, should be said for the negroes in such a case: they call their unfaithful treasurer "a thief," they do not say "defaulter.""
  • "We don't like politicians who have been unfaithful, and the last few years have brought a spate of them: Schwarzenegger, Sanford, Edwards, Spitzer, Craig, Giuliani, McGreevey and, depending on your definition of unfaithful, Weiner."