Definition of portentously adverb from the Oxford Advanced Learner's Dictionary

     

    portentously

     adverb
    adverb
    BrE BrE//pɔːˈtentəsli//
     
    ; NAmE NAmE//pɔːrˈtentəsli//
     
     
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  1. 1(literary) in a way that is important as a sign or a warning of something that is going to happen in the future, especially when it is something unpleasant His uncle portentously warned him about seeking vengeance.
  2. 2(formal, disapproving) in a very serious way that is intended to impress people synonym pompously She frowned portentously to add weight to her suggestion.