Definition of loony noun from the Oxford Advanced Learner's Dictionary

 

loony

 noun
noun
BrE BrE//ˈluːni//
 
; NAmE NAmE//ˈluːni//
 
 
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(pl. loonies) (also loon) (informal) a person who has strange ideas or who behaves in a strange way She’s a raving loony! Word Origin mid 19th cent.: abbreviation of lunatic.
See the Oxford Advanced American Dictionary entry: loony