Definition of "maniac" []

  • An insane person. (noun)
  • A person who has an excessive enthusiasm or desire for something: a sports maniac. (noun)
  • A person who acts in a wildly irresponsible way: maniacs on the highway. (noun)
  • Variant of maniacal. (adjective)
  • A wild disorderly person (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • A person who has a great craving or enthusiasm for something (noun)
  • A person afflicted with mania (noun) (c) HarperCollins Publishers Ltd 2016

Use "maniac" in a sentence
  • "This maniac is out of control and needs to be stopped."
  • "One G Beck screaming like a maniac is one too many for this country to handle."
  • "We have an emergency button to press if some maniac is holding us at gunpoint."