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unfaithful

[uhn-feyth-fuh l] /ʌnˈfeɪθ fəl/
adjective
1.
not faithful; false to duty, obligation, or promises; faithless; disloyal.
2.
not sexually faithful to a spouse or lover.
3.
not accurate or complete; inexact:
an unfaithful translation.
4.
Obsolete. unbelieving; infidel.
Origin
1350-1400
1350-1400; Middle English unfeithful. See un-1, faithful
Related forms
unfaithfully, adverb
unfaithfulness, noun
Synonyms
1. untrustworthy, deceitful, treacherous, recreant. 3. imprecise, untrue.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unfaithfully

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
3.
inaccurate; inexact; unreliable; untrustworthy: unfaithful copy
4.
(obsolete) not having religious faith; infidel
5.
(obsolete) not upright; dishonest
Derived Forms
unfaithfully, adverb
unfaithfulness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for unfaithfully

unfaithful

adj.

mid-14c., "acting falsely," from un- (1) "not" + faithful. In Middle English it also had a sense of "infidel, unbelieving, irreligious" (late 14c.). Sense of "not faithful in marriage" is attested from 1828. Related: Unfaithfully; unfaithfulness.

Online Etymology Dictionary, © 2010 Douglas Harper
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