Disposed to revenge; prompted or characterized by revenge; revengeful.

disposed to seek revenge or intended for revenge; "more vindictive than jealous love"- Shakespeare; "punishments...essentially vindictive in their nature"- M.R.Cohen

Punitive.

showing 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"