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vengeful

[venj-fuhl] / ˈvɛndʒ fəl /
ADJECTIVE
retaliating; hating
Synonyms
STRONGEST
antagonistic hostile vindictive
WEAK
avenging implacable inimical punitive rancorous relentless retaliatory revengeful spiteful unforgiving
Antonyms
STRONGEST
agreeable friendly kind nice
WEAK
condoning forgiving liking pardoning

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.