Seeking to harm or punish someone in return for a wrong or injury done to you; motivated by revenge.
From Old French 'vengier' (to avenge), derived from Latin 'vindicare' meaning to claim or avenge. The '-ful' suffix adds the meaning 'full of,' creating a word meaning 'full of vengeance.'
Revenge circuits in the brain are so powerful that studies show people will punish others even at great cost to themselves—it's like our brains are wired with a vengeance alarm that overrides logic and self-interest.
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