Synonyms of portentous

1. portentous, prodigious, significant (vs. insignificant), important: usage: of momentous or ominous significance; "such a portentous...monster raised all my curiosity"- Herman Melville; "a prodigious vision"
2. fateful, foreboding(prenominal), portentous, prophetic (vs. unprophetic), prophetical: usage: ominously prophetic
3. grandiloquent, overblown, pompous, pontifical, portentous, pretentious (vs. unpretentious): usage: puffed up with vanity; "a grandiloquent and boastful manner"; "overblown oratory"; "a pompous speech"; "pseudo-scientific gobbledygook and pontifical hooey"- Newsweek