feud
This word carries a heavy weight of history and stubbornness. It is not a simple argument or a temporary disagreement, but a deep-seated hostility that often persists across generations or long periods of time. It implies a cycle of retaliation where each act of aggression justifies the next.
Countable when referring to a specific conflict between two parties. Uncountable when referring to the general state of hostile warfare between groups.
Meanings
A prolonged and bitter quarrel or dispute, often between two families or groups.
"The two families have been locked in a blood feud for generations."
To engage in a prolonged and bitter quarrel.
"The two pop stars have been feuding over the charts for years."
To engage in a bitter quarrel.
"The neighboring clans continued to feud over land rights."