"portentous" in the adjective sense
1. portentous, prodigious
of momentous or ominous significance
"such a portentous...monster raised all my curiosity"- Herman Melville
"a prodigious vision"
2. fateful, foreboding, portentous
ominously prophetic
3. grandiloquent, overblown, pompous, pontifical, portentous
puffed up with vanity
"a grandiloquent and boastful manner"
"overblown oratory"
"a pompous speech"
"pseudo-scientific gobbledygook and pontifical hooey"- Newsweek
Source: WordNet® (An amazing lexical database of English)
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