a feeling of bitterness and ill will
rancour - hostility
‘Rancour’ does not simply refer to a form of anger, it expresses a deep-seated dislike or resentment that may last a long time. This element of bitter brooding over a wrong you feel someone has done to you associates this word with toxic feelings that can be harmful to yourself and others. It is often seen in the context of acrimonious political discussions.
Even though I feel I was fired unfairly, I bear no ill will to my old boss. It’s not good to let rancour take hold.
The controversial journalist’s appointment led to a rancorous debate among the newspaper’s board members.
There have been weeks of division and rancour in parliament over the best way to respond to the crisis.