Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Behaving or acting impulsively or rashly; wild.

from The Century Dictionary.

  • noun A person who acts madly or wildly; a flighty or harebrained person; one who indulges in frolics.
  • Pertaining to or resembling a madcap; wild; harum-scarum.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A person of wild behavior; an excitable, rash, violent person.
  • adjective Inclined to wild sports; delighting in rash, absurd, or dangerous amusements.
  • adjective Wild; reckless.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective impulsive, hasty or reckless; capricious.
  • noun An impulsive, hasty, capricious person.
  • noun obsolete An insane person, a lunatic.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective characterized by undue haste and lack of thought or deliberation
  • noun a reckless impetuous irresponsible person

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[mad + cap, head.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

1580s, mad +‎ cap (“head”), literally “crazy head”. Original literal sense “lunatic, crazy person”, now used figuratively.

Examples

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