unfaithful

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unfaithful /ˌʌnˈfeɪθfəl/ adjective
unfaithful
/ˌʌnˈfeɪθfəl/
adjective
Learner's definition of UNFAITHFUL
: having a sexual relationship with someone who is not your wife, husband, or partner often + to
: not accurate often + to

— unfaithfulness

noun [noncount]