vindictive

Definitions:

Given to revenge; revengeful.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Given to revenge; prompted by revenge.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)
Revengeful.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adjective) (adj.) (adjective)
Vindictiveness.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
Given to, or promoted by, revenge; inclined to hold a grudge; as, a vindictive person.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Vindictively.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adverb) (adv.) (adverb)

Usage examples:

This was the stranger who had taken so vindictive and ruthless a part in the questioning.
- The Heath Hover Mystery by Bertram Mitford
And fortune, too, is with us- your vindictive commandant, Captain Griffiths, is in London.
- The Zeppelin's Passenger by E. Phillips Oppenheim
He did not want her to think of him as vindictive in his spirit, and still less did he desire her to consider him petty in his motives and notions.
- Joan of Arc of the North Woods by Holman Day