The term CRUELTY EXTREME can be summarized by two crossword solutions: SADISM (6 letters) and ARTAUD (6 letters). SADISM is a psychological condition in which an individual derives pleasure from inflicting pain or humiliation on others. Antonin Artaud was a French dramatist, poet, and theatre director who developed the Theatre of Cruelty, a form of theatre that sought to shock audiences through its use of intense visuals, sound, and movement.