portentous

Adjective
  1. Of momentous or ominous significance (synset 302171721)
    "such a portentous...monster raised all my curiosity"; "a prodigious vision"
    similar to: important, significant - important in effect or meaning
    same as: prodigious
  2. Ominously prophetic (synset 301889205)
    similar to: prophetic, prophetical - foretelling events as if by supernatural intervention
    same as: fateful, foreboding
  3. Puffed up with vanity (synset 301855888)
    "a grandiloquent and boastful manner"; "overblown oratory"; "a pompous speech"; "pseudo-scientific gobbledygook and pontifical hooey"
    similar to: pretentious - making claim to or creating an appearance of (often undeserved) importance or distinction
    same as: grandiloquent, overblown, pompous, pontifical

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