rancor

This term describes a deep-seated, enduring bitterness that often persists long after the original cause of the conflict has vanished. It suggests a cold, simmering hostility rather than a sudden burst of anger, implying a psychological state of grudge-holding that colors every interaction between the parties involved. In social or political contexts, it refers to the palpable atmosphere of spite and malice that accompanies a dispute. It is typically used in formal or literary settings to describe an intensity of hatred that is expressed through harsh words or spiteful actions.