Definitions
1.NounA person who acts in a capricious, impulsive, or reckless manner.
2.NounA very foolish or irresponsible person; a fool, an idiot.
3.NounAn insane person; a lunatic. .mw-parser-output .defdate{font-size:smaller}
4.AdjectiveCapricious, impulsive, or reckless; also, bizarre, crazy, zany; or foolish, idiotic."a madcap activity a madcap idea a madcap plan; The film featured a madcap car chase that went right through a crowded café."