madcap

[mad-kap]
adjective
1.
wildly or heedlessly impulsive; reckless; rash: a madcap scheme.
noun
2.
a madcap person.

Origin:
1580–90; mad + cap1

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Collins
World English Dictionary
madcap (ˈmædˌkæp)
 
adj
1.  impulsive, reckless, or lively
 
n
2.  an impulsive, reckless, or lively person
 
[C16: from mad + cap (in the figurative sense: head)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

madcap
n. and adj., 1580s, from mad + cap, used figuratively for head.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

MADCAP definition


Math and set problems, for the Maniac II and CDC 6600. "MADCAP - A Scientific Compiler for a Displayed Formula Texbook Language", M.B. Wells, CACM 4(1):31-36 (Jan 1961). Sammet 1969, pp.271-281. Versions: Madcap 5 (1964), Madcap 6. "The Unified Data Structure Capability in Madcap 6", M.B. Wells et al, Intl J Comp Info Sci 1(3) (sep 1972).

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The result has been an open casting call for world-beating ideas, many of which are too madcap to take seriously.
Let your imagination run wild with this madcap pair.
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