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English definition of “nutcase”

nutcase

noun [C] uk   /ˈnʌt.keɪs/ informal or offensive us  
someone who behaves in an extremely silly way or an offensive term for someone who is mentally illOf unsound mindStupid and sillyStupid and silly people
(Definition of nutcase from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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