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English definition of “maniac”

maniac

noun [C] (MENTALLY ILL)    /ˈmeɪ.ni.æk/
a person who behaves in an uncontrolled way, not worrying about risks or danger: Some maniac was running down the street waving a massive metal bar.informal I won't get in the car with Richard - he drives like a maniac!Of unsound mindStupid and silly
(Definition of maniac noun (MENTALLY ILL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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