The black crows slowly circling the front entrance to your office building at 6:00 am may have a portentous quality, meaning it seems like they’re an omen indicating something bad will happen.

Use the adjective portentous to describe something that seems be a sign related to a future event — generally an ominous sign. Something that is portentous often seems to hint at or warn of a future disaster. For example, in a movie ominous music playing in the background while someone turns a dark corner can have a portentous quality, predicting doom for the hapless character.

Definitions of portentous

adj of momentous or ominous significance

“"such a portentous...monster raised all my curiosity"- Herman Melville”
important, significant
important in effect or meaning

adj ominously prophetic

fateful, foreboding
prophetic, prophetical
foretelling events as if by supernatural intervention

adj puffed up with vanity

grandiloquent, overblown, pompous, pontifical
making claim to or creating an appearance of (often undeserved) importance or distinction

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