unfaithful

[ uhn-feyth-fuhl ]
See synonyms for unfaithful on Thesaurus.com
adjective
  1. not faithful; false to duty, obligation, or promises; disloyal: Given how unfaithful the party has been to voters, it would be surprising if they won.

  2. not sexually loyal to a spouse or lover; adulterous: She was concerned her husband would be unfaithful when he travelled.

  1. not accurate or complete; inexact: The book was an unfaithful translation of the original.

  2. Obsolete. without religious faith; unbelieving.

Origin of unfaithful

1
First recorded in 1350–1400; Middle English unfeithful, unfaithful; un-1 + faithful

Other words for unfaithful

Other words from unfaithful

  • un·faith·ful·ly, adverb
  • un·faith·ful·ness, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use unfaithful in a sentence

  • In all their unfaithfulness, their very existence as a separate people is a standing miracle, witnessing to the truth of prophecy.

    Separation and Service | James Hudson Taylor
  • May hung her head like one accused of gross unfaithfulness, with some show of reason.

    A Houseful of Girls | Sarah Tytler
  • I considered her as a person whose sole merit had lain in her innocence, and whose unfaithfulness robbed her of all her charms.

    Queens of the French Stage | H. Noel Williams
  • Most of the allusions are too slightly sketched to permit this; but one or two are like him in their unfaithfulness.

  • Do men and women who are living in secret unfaithfulness hold exalted ideals of sex?

British Dictionary definitions for unfaithful

unfaithful

/ (ʌnˈfeɪθfʊl) /


adjective
  1. not true to a promise, vow, etc

  2. not true to a wife, husband, lover, etc, esp in having sexual intercourse with someone else

  1. inaccurate; inexact; unreliable; untrustworthy: unfaithful copy

  2. obsolete not having religious faith; infidel

  3. obsolete not upright; dishonest

Derived forms of unfaithful

  • unfaithfully, adverb
  • unfaithfulness, noun

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