unfaithful
AdjectiveUS[uhn-feyth-fuhl]/ənˈfeɪθfəl/3 syllables
Open English WordNet
Adjective (4)
- not true to duty or obligation or promises“an unfaithful lover”Opposite faithfulSimilar punic, apostate, untrueRelates to fidelity, faithfulnessSee also inconstant, untrustworthy
- having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend“her husband was unfaithful”Opposite faithfulSimilar adulterous, cheating
- having the character of, or characteristic of, a traitor“the faithless Benedict Arnold”“a lying traitorous insurrectionist”Synonyms: faithlesstraitoroustreasonabletreasonousOpposite loyalSimilar disloyal
- not trustworthy“an unfaithful reproduction”Opposite accurateSimilar inaccurate
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Webster's Dictionary (1913)
Un·faith′ful adjective
1. Not faithful; not observant of promises, vows, allegiance, or duty; violating trust or confidence; treacherous; perfidious; as, an unfaithful subject; an unfaithful agent or servant.
My feet, through wine, unfaithful to their weight.— Alexander Pope
His honor rooted in dishonor stood, And faith unfaithful kept him falsely true.— Alfred Tennyson
2. Not possessing faith; infidel. rare John Milton
— Un·faith′wb-a1′>′ful·ly, adverb — Un·faith′wb-a1′>′ful·ness, noun
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54