adjective
portentous - of or like a portent; ominous; foreboding
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The dark clouds gathering in the sky were a portentous sign of an impending storm.
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The eerie silence in the room was a bit portentous, don't you think?
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The way he looked at me with those intense eyes was totally portentous.
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Her sudden departure from the company was a portentous event that changed the course of our project.