Wild, reckless, and playfully crazy; or a wildly reckless person.
From 'mad' (crazy) plus 'cap' (head), literally meaning 'a mad head' or 'a crazy person.' Used in English from the 1600s onward to describe foolish escapades.
Madcap comedies like 1938's 'Bringing Up Baby' became a whole film genre—audiences loved watching characters abandon all sense in the service of love and laughter.
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