a reckless impetuous irresponsible person
characterized by undue haste and lack of thought or deliberation;
"a hotheaded decision"
"liable to such impulsive acts as hugging strangers"
"an impetuous display of spending and gambling"
- A madcap four minutes shortly after the interval seemingly ended the game as a contest.
- That last is Berowne, the merry madcap.
On the boards she was the merriest, gayest, madcap in the world.出自： Mabel Collins