unfaithfulness

unfaithful

[uhn-feyth-fuhl]
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; Middle English unfeithful. See un-1, faithful

unfaithfully, adverb
unfaithfulness, noun


1. untrustworthy, deceitful, treacherous, recreant. 3. imprecise, untrue.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unfaithful (ʌnˈfeɪθfʊl)
 
adj
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
 
un'faithfully
 
adv
 
un'faithfulness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

unfaithful
mid-14c., "acting falsely," from un- (1) "not" + faithful (see faith). In M.E. it also had a sense of "infidel, unbelieving, irreligious" (late 14c.). Sense of "not faithful in marriage" is attested from 1828.
Online Etymology Dictionary, © 2010 Douglas Harper
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