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3 definitions found
 for portentous
From 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]

From WordNet (r) 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,

From Moby Thesaurus II by Grady Ward, 1.0 :

  86 Moby Thesaurus words for "portentous":
     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,

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