Definition of lunatic adjective from the Oxford Advanced American Dictionary

 

lunatic

 adjective
adjective
NAmE//ˈlunəˌtɪk//
 
 
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  • crazy, ridiculous, or extremely stupid lunatic ideas a lunatic smile
  • Idioms
    the lunatic fringe(disapproving)
     
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    those members of a political or other group whose views are considered to be very extreme and crazy They stressed that only the lunatic fringe of the movement was involved in the incident.
    See the Oxford Advanced Learner's Dictionary entry: lunatic

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