Definition of “unfaithful” - English Dictionary

“unfaithful” in British English

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unfaithfuladjective

uk /ʌnˈfeɪθ.fəl/ us /ʌnˈfeɪθ.fəl/

(Definition of “unfaithful” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“unfaithful” in American English

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unfaithfuladjective

us /ʌnˈfeɪθ·fəl/

not loyal or able to be trusted:

an unfaithful friend

Unfaithful also means having a physical relationship with a person who is not your husband or wife.

(Definition of “unfaithful” from the Cambridge Academic Content Dictionary © Cambridge University Press)