The two crossword solutions for the term 'make fun of mercilessly' are 'ROAST' and 'SKEWER'. ROAST is a verb meaning to cook food by exposing it to dry heat, usually in an oven. It can also be used to describe a humorous speech or performance that is intended to amuse or ridicule someone. SKEWER is a verb meaning to pierce with a pointed object, such as a SKEWER, or to criticize or ridicule someone or something. In this context, both words can be used to describe the act of making fun of someone mercilessly.