bedlamite

/ˈbɛdləmaɪt/
noun
  1. A person who behaves in a wildly crazy or insane manner.
    • The man was shouting at the clouds like a bedlamite.
    • The novel's main character is a bedlamite who believes he is a king.
    • Only a bedlamite would try to cross that river during the storm.
Antonyms