Meaning of “lunatic” in the English Dictionary

"lunatic" in American English

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lunaticnoun [ C ]

us /ˈlu·nəˌtɪk/

a foolish or crazy person:

He drives like a lunatic.
lunatic
adjective [ not gradable ] us /ˈlu·nəˌtɪk/

a lunatic criminal

(Definition of “lunatic” from the Cambridge Academic Content Dictionary © Cambridge University Press)