vindictive
vin-DIK-tivadjMeaning wanting revenge; set on paying someone back
Memory hook VIN’s DICTionary of grudges. Vin keeps a whole dictionary of everyone who ever wronged him, and he plans to pay back every one. Vin is vindictive.
After losing at checkers, my vindictive cousin hid the winner’s shoes.
In context Most fans forgave the referee’s honest mistake, but one vindictive fan spent the whole season writing letters demanding that he be fired.
Similar vengeful, unforgiving, revengeful, resentful
Opposite forgiving, magnanimous, merciful
From Latin vindicta, “revenge.”