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portentous (adj.)

"of the nature of a portent, ominous," 1540s, from Latin portentosus "monstrous, marvelous, threatening," from portentem "portent," from portendere (see portend). Sometimes portentious, by influence of pretentious. Related: Portentously.

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Definitions of portentous

portentous (adj.)
ominously prophetic;
Synonyms: fateful / foreboding
portentous (adj.)
of momentous or ominous significance; "such a portentous...monster raised all my curiosity"- Herman Melville;
Synonyms: prodigious
portentous (adj.)
puffed up with vanity; "pseudo-scientific gobbledygook and pontifical hooey"- Newsweek;
From wordnet.princeton.edu