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English definition of “nut”

nut

noun (PERSON)    /nʌt/
[C] informal or offensive a person who behaves in a very silly, stupid, or strange way or an offensive term for a person who is mentally ill: What kind of nut would leave a car on a railway track?Of unsound mindStupid and sillyStupid and silly people [C] informal someone who is extremely enthusiastic about a particular activity or thing: Ian's a tennis nut - he plays every day. → See also nuts adjectiveEnthusiastsAdmirers
(Definition of nut noun (PERSON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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