Madness is foolish, impulsive behavior. It would be madness to ride on the back of your friend's car, standing on the bumper.

A screaming crowd waiting to see their favorite rock star creates an atmosphere of madness — and their enthusiasm itself can be described as madness. You could also say that donating all your money to an animal shelter would be madness, or describe the madness of a busy Thanksgiving Day sale. Madness sometimes takes on its original meaning, "mental instability" or "insanity."

Definitions of madness
  1. noun
    the quality of being rash and foolish
    synonyms: craziness, folly, foolishness
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    type of:
    a poor ability to understand or to profit from experience
  2. noun
    unrestrained excitement or enthusiasm
    “poetry is a sort of divine madness
    synonyms: rabidity, rabidness
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    type of:
    ebullience, enthusiasm, exuberance
    eager enjoyment or approval
  3. noun
    obsolete terms for legal insanity
    synonyms: insaneness, lunacy
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    type of:
    relatively permanent disorder of the mind
  4. noun
    a feeling of intense anger
    synonyms: fury, rage
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    intense anger (usually on an epic scale)
    a state of fury so great the face becomes discolored
    type of:
    anger, bile, choler, ire
    a strong emotion; a feeling that is oriented toward some real or supposed grievance
  5. noun
    an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain
    synonyms: hydrophobia, lyssa, rabies
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    type of:
    zoonosis, zoonotic disease
    an animal disease that can be transmitted to humans
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