Definition of portentous adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//pɔːˈtentəs//
    ; NAmE NAmE//pɔːrˈtentəs//
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  1. 1(literary) important as a sign or a warning of something that is going to happen in the future, especially when it is something unpleasant a portentous sign
  2. 2(formal, disapproving) very serious and intended to impress people synonym pompous a portentous remark
See the Oxford Advanced American Dictionary entry: portentous