Source : Webster's Revised Unabridged Dictionary (1913)

Revengeful \Re*venge"ful\, a.
   Full of, or prone to, revenge; vindictive; malicious;
   revenging; wreaking revenge.

         If thy revengeful heart can not forgive. --Shak.

         May my hands . . . Never brandish more revengeful
         steel.                                   --Shak.

   Syn: Vindictive; vengeful; resentful; malicious. --
        {Re*venge"ful*ly}, adv. -- {Re*venge"ful*ness}, n.

Source : WordNet®

revengeful
     adj : disposed to seek revenge or intended for revenge; "more
           vindictive than jealous love"- Shakespeare;
           "punishments...essentially vindictive in their nature"-
           M.R.Cohen [syn: {vindictive}, {vengeful}]