vitriolic

/ˌvɪtriˈɑːlɪk/
adjective
  1. Full of cruel and bitter criticism or hatred; harshly critical.
    • She wrote a vitriolic letter to the editor, complaining about the article.
    • Their argument became vitriolic, with personal insults flying back and forth.
    • The critic's vitriolic review of the movie angered the director.
Antonyms