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madcap

[mad-kap]
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adjective
  1. wildly or heedlessly impulsive; reckless; rash: a madcap scheme.
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noun
  1. a madcap person.
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Origin of madcap

First recorded in 1580–90; mad + cap1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for madcap

madcap

adjective
  1. impulsive, reckless, or lively
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noun
  1. an impulsive, reckless, or lively person
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Word Origin

C16: from mad + cap (in the figurative sense: head)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for madcap

1580s, noun and adjective, from mad (adj.) + cap, used here figuratively for "head." Related: Madcappery.

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Online Etymology Dictionary, © 2010 Douglas Harper