maniac

Part of speech: adjective

Maniacal.

Part of speech: adverb

Maniacally.

Part of speech: noun

A person wildly insane; a madman.

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Usage examples "maniac":

  1. Some members of the police entered, and took the maniac away. - "Mabel's Mistake", Ann S. Stephens.
  2. Why, by this time she's a raving maniac! - "The Living Link", James De Mille.
  3. I had seen her a raving maniac. - "Isaac T. Hopper", L. Maria Child.