Source : Webster's Revised Unabridged Dictionary (1913)

Furious \Fu"ri*ous\, a. [L. furiosus, fr. furia rage, fury: cf.
   F. furieux. See {Fury}.]
   1. Transported with passion or fury; raging; violent; as, a
      furious animal.

   2. Rushing with impetuosity; moving with violence; as, a
      furious stream; a furious wind or storm.

   Syn: Impetuous; vehement; boisterous; fierce; turbulent;
        tumultuous; angry; mad; frantic; frenzied. --
        {Fu"ri*ous*ly}, adv. -- {Fu"ri*ous*ness}, n.

Source : WordNet®

furious
     adj 1: marked by extreme and violent energy; "a ferocious beating";
            "fierce fighting"; "a furious battle" [syn: {ferocious},
             {fierce}, {savage}]
     2: marked by extreme anger; "the enraged bull attached";
        "furious about the accident"; "a furious scowl";
        "infuriated onlookers charged the police who were beating
        the boy"; "could not control the maddened crowd" [syn: {angered},
         {enraged}, {infuriated}, {maddened}]
     3: (of the elements) as if showing violent anger; "angry clouds
        on the horizon"; "furious winds"; "the raging sea" [syn: {angry},
         {raging}, {tempestuous}, {wild}]