Adjective
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puffed up with vanity
"a grandiloquent and boastful manner"
"overblown oratory"
"a pompous speech"
"pseudo-scientific gobbledygook and pontifical hooey"- Newsweek
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ominously prophetic
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of momentous or ominous significance
"such a portentous...monster raised all my curiosity"- Herman Melville
"a prodigious vision"