Vindictive

vin·dic·tive
vēnˈdiktiv/
adjective
adjective: vindictive

having or showing a strong or unreasoning desire for revenge.
"the criticism was both vindictive and personalized"
synonyms: vengeful, revengeful, unforgiving, resentful, acrimonious, bitter; spiteful, mean, rancorous, venomous, malicious, malevolent, nasty, mean-spirited, cruel, unkind;
informalcatty
"in her memoirs she revealed that Drake had been a vindictive ex-lover"