Dictionary.com

unfaithful

[ uhn-feyth-fuhl ]
/ ʌnˈfeɪθ fəl /
See synonyms for unfaithful on Thesaurus.com

adjective

not faithful; false to duty, obligation, or promises; faithless; disloyal.
not sexually faithful to a spouse or lover.
not accurate or complete; inexact: an unfaithful translation.
Obsolete. unbelieving; infidel.

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Origin of unfaithful

First recorded in 1350–1400, unfaithful is from the Middle English word unfeithful.See un-1, faithful

OTHER WORDS FROM unfaithful

un·faith·ful·ly, adverbun·faith·ful·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Words related to unfaithful

cheating, untrue, deceitful, faithless, fickle, inconstant, incontinent, perfidious, recreant, shifty, snaky, traitorous, treacherous, two-faced, two-timing, unreliable, untrustworthy, wicked, false-hearted, sneaking

Example sentences from the Web for unfaithful

British Dictionary definitions for unfaithful

unfaithful
/ (ʌnˈfeɪθfʊl) /

adjective

not true to a promise, vow, etc
not true to a wife, husband, lover, etc, esp in having sexual intercourse with someone else
inaccurate; inexact; unreliable; untrustworthyunfaithful copy
obsolete not having religious faith; infidel
obsolete not upright; dishonest

Derived forms of unfaithful

unfaithfully, adverbunfaithfulness, 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