Get the Oxford Advanced American Dictionary app Find out more about Oxford American Dictionaries for learners of English Get an Oxford Advanced American Dictionary searchbox for your website Ask Text Checker

Definition of lunatic adjective from the Oxford Advanced American Dictionary

lunatic

adjective
/ˈlunəˌtɪk/ lunatic pronunciation American
 
crazy, ridiculous, or extremely stupidlunatic ideasa lunatic smileIDIOM

the lunatic fringe

(disapproving) those members of a political or other group whose views are considered to be very extreme and crazyThey stressed that only the lunatic fringe of the movement was involved in the incident.the lunatic fringe