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Definition of madcap:

  1. A person of wild behavior; an excitable, rash, violent person.
  2. Inclined to wild sports; delighting in rash, absurd, or dangerous amusements.
  3. Wild; reckless.


impetuous, slapdash, laughable, ill-considered, crazy, overbold, hothead, tearaway, wild, adventurous, precipitant, overconfident, rash, stupid, temerarious, over-the-top, careful, brainish, swashbuckler, childish, ludicrous, foolish, foolish, brash, foolhardy, impulsive, reckless, headlong, rash, harum-scarum, audacious, adventurous, improvident, not in your right mind/not right in the head, unconsidered, hasty, precipitate, lunatic, daring, daredevil, daring, madman, incautious, insane, mad, silly, ridiculous, wild, maniac, hotheaded, stupid, fire-eater.

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