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1. WordNet® 3.0 (2006)
    adj 1: of momentous or ominous significance; "such a
           portentous...monster raised all my curiosity"- Herman
           Melville; "a prodigious vision" [syn: portentous,
    2: ominously prophetic [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,

2. The Collaborative International Dictionary of English v.0.48
Portentous \Por*tent"ous\, a. [L. portentosus.]
   1. Of the nature of a portent; containing portents;
      foreshadowing, esp. foreshadowing ill; ominous.
      [1913 Webster]

            For, I believe, they are portentous things. --Shak.
      [1913 Webster]

            Victories of strange and almost portentous splendor.
      [1913 Webster]

   2. Hence: Monstrous; prodigious; wonderful; dreadful; as, a
      beast of portentous size. --Roscommon.
      [1913 Webster] -- Por*tent"ous*ly, adv. --
      Por*tent"ous*ness, n.
      [1913 Webster]

Thesaurus Results for portentous:

1. Moby Thesaurus II by Grady Ward, 1.0
alarming, amazing, apocalyptic, astonishing, astounding, awe-inspiring, awesome, bad, baleful, baneful, black, bodeful, boding, dark, dire, doomful, dreary, earnest, evil, evil-starred, exceptional, extraordinary, fabulous, fantastic, fatal, fateful, foreboding, forerunning, forewarning, formidable, gloomy, grave, heavy, ill, ill-boding, ill-fated, ill-omened, ill-starred, imposing, inauspicious, indescribable, ineffable, legendary, lowering, marvelous, menacing, mind-boggling, miraculous, momentous, mythical, noteworthy, of evil portent, ominous, phenomenal, portending, precautional, precautionary, precursive, precursory, premonitory, prodigious, prodromal, prodromic, remarkable, serious, sinister, sober, solemn, somber, star-crossed, stupefying, stupendous, threatening, unexampled, unfavorable, unfortunate, unlucky, unparalleled, unprecedented, unpromising, unpropitious, unspeakable, untoward, weighty, wonderful, wondrous
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