acrimonious
adjective /ˌækrɪˈməʊniəs/
  /ˌækrɪˈməʊniəs/
 (formal)- (of an argument, etc.) angry and full of strong bitter feelings and words synonym bitter
- His parents went through an acrimonious divorce.
 
Oxford Collocations DictionaryAcrimonious is used with these nouns:- debate
 - dispute
 - divorce
 - …
 
Word Originearly 17th cent. (in the sense ‘bitter, pungent’): from acrimony + -ous.