Open English Wordnet
Adjectives
(s)revengeful, vindictive, vengefuldisposed to seek revenge or intended for revenge“more vindictive than jealous love” (Shakespeare), “punishments...essentially vindictive in their nature” (M.R.Cohen)
(s)despiteful, spiteful, vindictiveshowing malicious ill will and a desire to hurt; motivated by spite“a despiteful fiend”, “a truly spiteful child”, “a vindictive man will look for occasions for resentment”