madcap /ˈmædkæp/noun 3adjective 1forms 3 noun3 •A person who acts in a capricious, impulsive, or reckless manner.Come-on you mad-cap: Ile to the Ale-house vvith you presently; […] — 1590 •A very foolish or irresponsible person; a fool, an idiot.[R]un around as he commands. He is a madcap and we must learn to live with him. We are in his hands. — 1983 •(no longer used, rare) An insane person; a lunatic.VVhy vvhat a mad-cap hath heauen lent vs here? — 1596 adjective1 •Capricious, impulsive, or reckless; also, bizarre, crazy, zany; or foolish, idiotic.The film featured a madcap car chase that went right through a crowded café. formsmadcaps · more madcap · most madcap