noun
a wild and reckless person, typically one who behaves in a foolish or impulsive way
adjective
showing a lack of proper seriousness or caution; recklessly impulsive or foolish
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The madcap antics of the young students were a cause for concern among the teachers.
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The madcap road trip with my friends was one for the books.
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That madcap skateboarder just pulled off an insane trick!
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Her madcap approach to life always keeps things interesting.