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

 

loony

 adjective
adjective
BrE BrE//ˈluːni//
 
; NAmE NAmE//ˈluːni//
 
Describing strange traits
 
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(informal) crazy or strange He does have some pretty loony ideas. It seemed like another one of his loony projects. See related entries: Describing strange traits Word Origin mid 19th cent.: abbreviation of lunatic.
See the Oxford Advanced American Dictionary entry: loony