The term 'CRUEL ONE' can be described by four-letter word 'OGRE', five-letter words 'BRUTE' and 'BEAST', six-letter words 'MEANIE' and 'SADIST'. An OGRE is a mythical creature usually depicted as a large, hideous, and monstrous humanoid. A BRUTE is a cruel, violent, or insensitive person. A BEAST is an animal, especially a large or dangerous one. A MEANIE is someone who is unkind or unpleasant. A SADIST is someone who derives pleasure from inflicting pain on others. All of these words describe someone who is cruel and unkind.