portentous

adjectives

of momentous or ominous significance

"such a portentous...monster raised all my curiosity"- Herman Melville; "a prodigious vision"

portentous, prodigious

is derived from

ominously prophetic

fateful, foreboding, portentous

is derived from

puffed up with vanity

"a grandiloquent and boastful manner"; "overblown oratory"; "a pompous speech"; "pseudo-scientific gobbledygook and pontifical hooey"- Newsweek