A maniac is a mad person who is violent and dangerous, or someone who has a strong interest in something. Learn more about the word forms, synonyms, pronunciation, and usage of maniac in British and American English. The meaning of MANIAC is someone who is or acts mentally unsound ; especially : a person who behaves in a wildly foolish, reckless, or dangerous manner. How to use maniac in a sentence. A maniac is a crazy person. Screaming like a maniac is never a good way to get your point across.

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