madcap.
A person who acts in a capricious, impulsive, or reckless manner.
Meaning & usage
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.
Where this word comes from
The noun is derived from mad + cap (“(informal) head”). The adjective is from an attributive use of the noun.
Capricious, 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.
Where this word comes from
The noun is derived from mad + cap (“(informal) head”). The adjective is from an attributive use of the noun.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.