PORTENTOUS Meaning of PORTENTOUS in English portentous BrE AmE pɔː ˈtent əs !!-ˈten t ʃ- AmE \ pɔːr ˈten t̬ əs poʊr- ▷ portentous|ly li▷ portentous|ness nəs nɪs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012