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.

In Maniac, a paranoid schizophrenic and a depressed woman join a very weird experimental program designed to cure mental illness for good using drugs and computers.

Maniac follows Annie Landsberg and Owen Milgrim, two strangers who connect during a risky, psychologically intense, twelve-person, mind-bending pharmaceutical trial conducted by …

Idiom like a maniac (Definition of maniac from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

1. A psychotic or otherwise mentally ill person who exhibits violent or bizarre behavior. Not used in psychiatric diagnosis. 2. A person who has an excessive enthusiasm or desire for something: …

If you describe someone's behaviour as maniac, you are emphasizing that it is extremely foolish and uncontrolled.

Maniac definition: a raving or violently insane person; lunatic.. See examples of MANIAC used in a sentence.