portentous

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
1

adj of momentous or ominous significance

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

adj ominously prophetic

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

adj puffed up with vanity

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

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