acrimonious
adjective
formal uk/ˌækrɪˈməʊniəs/ usinvolving a lot of anger and arguments:
an acrimonious battle/debate/dispute Two top executives at the company resigned after an acrimonious battle for control.
an acrimonious departure/split/takeover The corporate takeover led to an acrimonious split with Mr Murray who was forced out of the company.