Etymology
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madcap

1580s, noun ("person who acts madly or wildly") and adjective ("wild, harum-scarum), from mad (adj.) + cap, used here figuratively for "head." Related: Madcappery. Compare mad-brain "rash or hot-headed person" (1560s).

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Definitions of madcap
1
madcap (n.)
a reckless impetuous irresponsible person;
2
madcap (adj.)
characterized by undue haste and lack of thought or deliberation; (`brainish' is archaic);
madcap escapades
Synonyms: hotheaded / impulsive / impetuous / tearaway / brainish
From wordnet.princeton.edu