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English definition of “maniac”

maniac

noun [C] uk   /ˈmeɪ.ni.æk/ us  

maniac noun [C] (INTERESTED)

informal a person who has a very strong interest in a particular activity: a football/sex maniac

maniac noun [C] (MENTALLY ILL)

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!
(Definition of maniac from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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