The adjective acrimonious means something that is full of anger, arguments and bad feelings.
Synonyms are belligerent, rancorous, cranky, or spiteful.
The word origins from French (1610) acrimonieux, from Medieval Latin acrimoniosus, and Latin acrimonia meaning “sharpness”. Its figurative meaning “bitter, irritating in manner”, of dispositions, debates, etc., was first used in 1775.
We need to get out of this increasingly acrimonious situation.
The public is a witness to the acrimonious relationship of the two celebrities.
You have to handle well this acrimonious dispute.