The Collaborative International Dictionary of English v.0.48:
Vengeful \Venge"ful\, a. Vindictive; retributive; revengeful. "Vengeful ire." --Milton. -- Venge"ful*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
vengefully adv 1: in a vindictive, revengeful manner; "he plotted vindictively against his former superiors" [syn: revengefully, vengefully, vindictively]