por·ten·tous /pɔrˈtɛntəs, por-/
  (a.)前兆的,不吉的,可驚的,奇怪的,自大的
  Por·tent·ous a.
  1. Of the nature of a portent; containing portents; foreshadowing, esp. foreshadowing ill; ominous.
     For, I believe, they are portentous things.   --Shak.
     Victories of strange and almost portentous splendor.   --Macaulay.
  2. Hence: Monstrous; prodigious; wonderful; dreadful; as, a beast of portentous size.
  -- Por*tent*ous*ly, adv. -- Por*tent*ous*ness, n.
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  portentous
       adj 1: of momentous or ominous significance; "such a
              portentous...monster raised all my curiosity"- Herman
              Melville; "a prodigious vision" [syn: prodigious]
       2: of ominous significance [syn: fateful, foreboding(a)]
       3: puffed up with vanity; "a grandiloquent and boastful
          manner"; "overblown oratory"; "a pompous speech";
          "pseudo-scientific gobbledygook and pontifical hooey"-
          Newsweek [syn: grandiloquent, overblown, pompous, pontifical]