Vitriolic
/ˌvɪtriˈɒlɪk/ adjective hardFilled with bitter, harsh criticism or hatred, especially in speech or writing.
The film received a vitriolic review that called it the worst release of the decade.
Memory Trick
Vitriolic comes from 'vitriol,' an old name for corrosive sulfuric acid -- vitriolic words burn and corrode a reputation the way acid eats through metal.