madcap🔊

A person who acts in a capricious, impulsive, or reckless manner.

(South Asia) A very foolish or irresponsible person; a fool, an idiot. +

(obsolete, rare) An insane person; a lunatic. +

Capricious, impulsive, or reckless; also, bizarre, crazy, zany; or foolish, idiotic.