vindictive

disposed to seek revenge or intended for revenge

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

Latin 'vindicta' meaning vengeance

“Lady Blandish had revived his jealousy of the creature who menaced it, and jealousy of a System is unreflecting and vindictive as jealousy of woman.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“He could be self-righteous, resentful, and vindictive, often holding grudges for years.”