The Collaborative International Dictionary of English v.0.48:

Huge \Huge\, a. [Compar. Huger; superl. Hugest.] [OE. huge,
   hoge, OF. ahuge, ahoge.]
   Very large; enormous; immense; excessive; -- used esp. of
   material bulk, but often of qualities, extent, etc.; as, a
   huge ox; a huge space; a huge difference. "The huge
   confusion." --Chapman. "A huge filly." --Jer. Taylor. --
   Huge"ly, adv. -- Huge"ness, n.
   [1913 Webster]

         Doth it not flow as hugely as the sea.   --Shak.

   Syn: Enormous; gigantic; colossal; immense; prodigious; vast.
        [1913 Webster]

WordNet (r) 3.0 (2006):

huge
    adj 1: unusually great in size or amount or degree or especially
           extent or scope; "huge government spending"; "huge
           country estates"; "huge popular demand for higher
           education"; "a huge wave"; "the Los Angeles aqueduct
           winds like an immense snake along the base of the
           mountains"; "immense numbers of birds"; "at vast (or
           immense) expense"; "the vast reaches of outer space";
           "the vast accumulation of knowledge...which we call
           civilization"- W.R.Inge [syn: huge, immense, vast,
           Brobdingnagian]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "huge":
   Atlantean, Brobdingnagian, Cyclopean, Gargantuan, Herculean,
   Homeric, abysmal, amplitudinous, astronomic, astronomical, awesome,
   boundless, bulky, colossal, cosmic, elephantine, enormous, epic,
   extensive, galactic, gargantuan, giant, giantlike, gigantic, great,
   heroic, immeasurable, immense, infinite, jumbo, king-size, large,
   leviathan, mammoth, massive, massy, mighty, monster, monstrous,
   monumental, mountainous, outsize, overgrown, prodigious, profound,
   sizable, spacious, stupendous, titanic, towering, tremendous, vast,
   voluminous, weighty, whopping