convict

v.（在法庭上）宣判…有罪，證明…有罪
to decide officially in a law court that someone is guilty of a crime

He has twice been convicted of robbery.

caustic

a.（話語或說話方式）刻薄的，尖刻的，挖苦的
A caustic remark or way of speaking is hurtful, critical, or intentionally unkind.

She's famous in the office for her caustic wit.