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

loony

adjective
 
/ˈluːni/
 
/ˈluːni/
(informal, sometimes offensive)
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  1. crazy or strange
    • She does have some pretty loony ideas.
    • It seemed like another one of his loony projects.
    Word Originmid 19th cent.: abbreviation of lunatic.
See loony in the Oxford Advanced American Dictionary
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