[syn: exceeding, exceptional, olympian, prodigious, surpassing]
The Collaborative International Dictionary of English v.0.48:
Prodigious \Pro*di"gious\, a. [L. prodigiosus, fr. prodigium a
   prodigy; cf. F. prodigieux. See Prodigy.]
   [1913 Webster]
   1. Of the nature of a prodigy; marvelous; wonderful;
      portentous. [Obs. or R.] --Spenser.
      [1913 Webster]
            It is prodigious to have thunder in a clear sky.
                                                  --Sir T.
                                                  Browne.
      [1913 Webster]
   2. Extraordinary in bulk, extent, quantity, or degree; very
      great; vast; huge; immense; as, a prodigious mountain; a
      prodigious creature; a prodigious blunder. "Prodigious
      might." --Milton.
      [1913 Webster]
   Syn: Huge; enormous; monstrous; portentous; marvelous;
        amazing; astonishing; extraordinary.
        [1913 Webster]
WordNet (r) 3.0 (2006):
prodigious
    adj 1: so great in size or force or extent as to elicit awe;
           "colossal crumbling ruins of an ancient temple"; "has a
           colossal nerve"; "a prodigious storm"; "a stupendous
           field of grass"; "stupendous demand" [syn: colossal,
           prodigious, stupendous]
    2: of momentous or ominous significance; "such a
       portentous...monster raised all my curiosity"- Herman
       Melville; "a prodigious vision" [syn: portentous,
       prodigious]
    3: far beyond what is usual in magnitude or degree; "a night of
       exceeding darkness"; "an exceptional memory"; "olympian
       efforts to save the city from bankruptcy"; "the young
       Mozart's prodigious talents" [syn: exceeding,
       exceptional, olympian, prodigious, surpassing]
Moby Thesaurus II by Grady Ward, 1.0:
114 Moby Thesaurus words for "prodigious":
   Atlantean, Brobdingnagian, Cyclopean, Gargantuan, Herculean,
   Homeric, abysmal, amazing, amplitudinous, astonishing, astounding,
   astronomic, astronomical, awesome, beguiling, bewildering,
   bewitched, boundless, bulky, colossal, cosmic, cracking, cyclopean,
   dumbfounding, elephantine, enchanted, enigmatic, enormous, epic,
   exceptional, extensive, extraordinary, fabulous, fantastic,
   fascinating, flabbergasting, galactic, gargantuan, giant,
   giantlike, gigantic, heroic, huge, humongous, immeasurable,
   immense, incomprehensible, inconceivable, incredible,
   indescribable, ineffable, infinite, jumbo, king-size, large,
   legendary, leviathan, magical, mammoth, marvelous, massive, massy,
   mighty, mind-blowing, mind-boggling, miraculous, monster,
   monstrous, monumental, mortal, mountainous, mythical, necromantic,
   notable, noteworthy, outlandish, outsize, overgrown,
   passing strange, phenomenal, portentous, profound, puzzling, rare,
   remarkable, sensational, sizable, spacious, spectacular,
   staggering, startling, strange, striking, stupefying, stupendous,
   surprising, thaumaturgic, titanic, towering, tremendous,
   unexampled, unheard-of, unimaginable, unique, unparalleled,
   unprecedented, unspeakable, unusual, vast, voluminous, weighty,
   wonder-working, wonderful, wondrous