Define villain (noun) and get synonyms. What is villain (noun)? villain (noun) meaning, pronunciation and more by Macmillan Dictionary. A villain is a bad person — real or made up. In books, movies, current events, or history, the villain is the character who does mean, evil things on purpose. A dramatic or fictional character who is typically at odds with the hero. 3. (also vĭl ′ān′, vĭ-lān′) Variant of villein. 4. Something said to be the cause of.