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unfaithful

un·faith·ful

unfaithful

pronunciation:
uhn feIth fl
part of speech: adjective
definition 1: having violated a promise or obligation; disloyal.
synonyms:
disloyal, faithless, false, traitorous, treacherous
antonyms:
faithful, loyal, stalwart, staunch, true
similar words:
double-dealing, false-hearted, inconstant, perfidious, recreant, undependable, unreliable, untrustworthy
definition 2: having violated a promise of sexual faithfulness, esp. to a spouse; adulterous.
synonyms:
adulterous, faithless, two-timing, untrue
antonyms:
faithful
similar words:
adulterate, disloyal, false-hearted
definition 3: not accurate or reliable, esp. as a representation or copy of something.
synonyms:
inaccurate, inexact
antonyms:
faithful
similar words:
defective, erroneous, flawed, imprecise, incomplete, incorrect, unreliable, untrue
derivations: unfaithfully (adv.), unfaithfulness (n.)