# madcap

> English word · Noun · IPA /ˈmædkæp/ · frequency rank #57,540

## Definitions
1. A person who acts in a capricious, impulsive, or reckless manner.
2. A very foolish or irresponsible person; a fool, an idiot.
3. An insane person; a lunatic.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/madcap