Source : Webster's Revised Unabridged Dictionary (1913)

Vengeful \Venge"ful\, a.
   Vindictive; retributive; revengeful. ``Vengeful ire.''
   --Milton. -- {Venge"ful*ly}, adv.

Source : WordNet®

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