UNFAITHFUL Meaning of UNFAITHFUL in English unfaithful BrE AmE ( ˌ ) ʌn ˈfeɪθ f ə l -fʊl ▷ unfaithful|ly i▷ unfaithful|ness nəs nɪs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012