definitions

unfaithful

[ uhn-feyth-fuhl ]
/ ʌnˈfeɪθ fəl /
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SEE MORE 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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RELATED WORDS

defection, disloyalty, apostasy, perfidy, dereliction, treason, treachery, inconstancy, improbity, recreancy

Nearby words

unfailing, unfair, unfair competition, unfair practice, unfaith, unfaithful, unfamiliar, unfancied, unfashionable, unfasten, unfathered

Origin of unfaithful

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

Related forms

un·faith·ful·ly, adverbun·faith·ful·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unfaithfulness

British Dictionary definitions for unfaithfulness

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

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