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Added 10 October 2026

madcap

/ˈmædkæp/ noun

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about madcap at Wordnik → Where our words come from →

A person who acts in a capricious, impulsive, or reckless manner.
A very foolish or irresponsible person; a fool, an idiot.
An insane person; a lunatic. .mw-parser-output .defdate{font-size:smaller}

adjective

Capricious, impulsive, or reckless; also, bizarre, crazy, zany; or foolish, idiotic.
a madcap activity a madcap idea a madcap plan

Origin

The noun is derived from mad + cap (“(informal) head”). The adjective is from an attributive use of the noun.

From Wiktionary, via Kaikki.org (CC BY-SA)

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