lunatic /ˈluːnətɪk/noun 1adjective 3forms 3 noun1 •a person whose mind is not well, who acts in a wild or dangerous wayYou may be right I may be crazy Oh, but it just may be a lunatic you're looking for — 1980 adjective3 •Crazed, mad, insane, demented. •(literary, rare) Relating to the Moon; lunar.As the narrator turns his attention to the moon itself and its Lunatic inhabitants, Heinsius seems to draw on the True History, but is still within the confines of the Icaromenippus. — 1996 •(literary, rare) Influenced or affected by the Moon.This I remember: she was false as the lunatic sea. — 1956 formslunatics · more lunatic · most lunatic