Source : Webster's Revised Unabridged Dictionary (1913)

Colossal \Co*los"sal\, a. [Cf. F. colossal, L. colosseus. See
   {Colossus}.]
   1. Of enormous size; gigantic; huge; as, a colossal statue.
      ``A colossal stride.'' --Motley.

   2. (Sculpture & Painting) Of a size larger than heroic. See
      {Heroic}.

Source : WordNet®

colossal
     adj : 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: {prodigious},
            {stupendous}]