Caustic wit is a type of humor characterized by sharp, often ironic remarks. It is often used to make a point or to mock someone. The two crossword solutions for the term caustic wit are 'SARCASM' and 'sarcast'. SARCASM is defined as the use of irony to mock or convey contempt, while SARCASM is defined as the use of irony to mock or convey scorn. Both terms are often used interchangeably to describe caustic wit.