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Adjective madcap has 1 sense
hotheaded, impulsive, impetuous, madcap, tearaway, brainish - characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)Antonym:  cautious (indirect, via incautious)
 
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