vendetta

noun3

1. •
   Revenge.
2. •
   A motivational grudge against a person or faction, which may or may not be reciprocated; the state of having it in for someone.

   • The source added: “It appears to me a very personal vendetta that doesn’t have long term interests both for the kingdom and for the US and for intelligence cooperation in the future.” — 2021
3. •
   A bitter, destructive feud, normally between two families, clans, or factions, in which each injury or slaying is revenged: a blood feud.

   • The families had been locked in a bitter vendetta for generations.