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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
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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Example sentences
Recombinants appear when a mate is unfaithful and links up genes that were
  never meant for each other.
The narrative choices open to the prequel makers, therefore, exist on a
  spectrum from the unsurprising to the unfaithful.
It's husbands and wives looking to catch unfaithful spouses.
Those that blindly support the equations are unfaithful to the physical reality
  those equations were supposed to represent.
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