A maniac is a crazy person. Screaming like a maniac is never a good way to get your point across.

Long ago, the word maniac was an official psychiatric term that meant “a patient suffering from mania,” or manic disorder, involving a euphoric mood and extreme energy. Maniac isn’t used in a clinical way anymore, but only informally to mean “lunatic.” You might describe yourself running around the house like a maniac looking for your car keys, or dismiss your sports-obsessed brother as “a football maniac.” The Greek root is mania, or “madness.”

Definitions of maniac
  1. noun

    an insane person

    lunatic, madman
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    crazy, looney, loony, nutcase, weirdo

    someone deranged and possibly dangerous

    an archaic term for a lunatic

    a person with a mania for setting things on fire

    a woman lunatic
    type of:

    diseased person, sick person, sufferer

    a person suffering from an illness

  2. noun

    a person who has an obsession with or excessive enthusiasm for something

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    type of:

    enthusiast, fancier

    a person having a strong liking for something

  3. adjective

    wildly disordered



    afflicted with or characteristic of mental derangement

Word Family