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English definition of “loony”

loony

adjective uk   /ˈluː.ni/ informal us  
silly or stupid: He had lots of loony ideas about education.Stupid and sillyOf unsound mind

loony

noun [C] uk   /ˈluː.ni/ informal us  
a person who is crazy, silly, or strange: He considered that most of the people he had to deal with were loonies of one sort or another.
(Definition of loony from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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