Source : Webster's Revised Unabridged Dictionary (1913)

Prodigious \Pro*di"gious\, a. [L. prodigiosus, fr. prodigium a
   prodigy; cf. F. prodigieux. See {Prodigy}.]
   1. Of the nature of a prodigy; marvelous; wonderful;
      portentous. [Obs. or R.] --Spenser.

            It is prodigious to have thunder in a clear sky.
                                                  --Sir T.
                                                  Browne.

   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.

   Syn: Huge; enormous; monstrous; portentous; marvelous;
        amazing; astonishing; extraordinary.

Source : WordNet®

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},
             {stupendous}]
     2: of momentous or ominous significance; "such a
        portentous...monster raised all my curiosity"- Herman
        Melville; "a prodigious vision" [syn: {portentous}]
     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}, {surpassing}]