<p><strong>Noun:</strong></p><ul><li>an evil spirit; devil or fiend.</li><li>an evil passion or influence.</li><li>a person considered extremely wicked, evil, or cruel.</li><li>a person with great energy, drive, etc.: He's a demon for work.</li><li>a person, especially a child, who is very mischievous: His younger son is a real little demon.</li><li>daemon.</li><li>Australian Slang: a policeman, especially a detective.</li></ul><p><strong>Adjective:</strong></p><ul><li>of, pertaining to, characteristic of, or noting a demon.</li><li>possessed or controlled by a demon.</li></ul>