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®

revengefully
     adv : in a vindictive, revengeful manner; "he plotted vindictively
           against his former superiors" [syn: {vengefully}, {vindictively}]