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.

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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.

[TahlilGaran] English Dictionary ▲