NEFARIOUS Meaning of NEFARIOUS in English nefarious BrE AmE nɪ ˈfeər i‿əs nə-, ne- AmE \ -ˈfer- -ˈfær- ▷ nefarious|ly li▷ nefarious|ness nəs nɪs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012