Source : Webster's Revised Unabridged Dictionary (1913)

Fiery \Fi"er*y\ (? or ?), a. [Formerly written firy, fr. fire.]
   1. Consisting of, containing, or resembling, fire; as, the
      fiery gulf of Etna; a fiery appearance.

            And fiery billows roll below.         --I. Watts.

   2. Vehement; ardent; very active; impetuous.

            Hath thy fiery heart so parched thine entrails?
                                                  --Shak.

            The fiery spirit of his forefathers.  --W. Irwing.

   3. Passionate; easily provoked; irritable.

            You know the fiery quality of the duke. --Shak.

   4. Unrestrained; fierce; mettlesome; spirited.

            One curbed the fiery steed.           --Dryden.

   5. heated by fire, or as if by fire; burning hot; parched;
      feverish. --Pope.

            The sword which is made fiery.        --Hooker.

   {Fiery cross}, a cross constructed of two firebrands, and
      pitched upon the point of a spear; formerly in Scotland
      borne by a runner as a signal for the clan to take up
      arms. --Sir W. Scott.

Source : WordNet®

fiery
     adj 1: characterized by intense emotion; "ardent love"; "an ardent
            lover"; "a burning enthusiasm"; "a fervent desire to
            change society"; "a fervent admirer"; "fiery oratory";
            "an impassioned appeal"; "a torrid love affair" [syn:
            {ardent}, {burning(a)}, {fervent}, {fervid}, {impassioned},
             {perfervid}, {torrid}]
     2: like or suggestive of fire; "the burning sand"; "a fiery
        desert wind"; "an igneous desert atmosphere" [syn: {igneous}]
     3: very intense; "a fiery temper"; "flaming passions" [syn: {flaming}]