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slaphappy, devil-may-care, carefree, freewheeling, happy-go-lucky, harum-scarum | cheerfully irresponsible | |
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swashbuckler, daredevil, madcap, hothead, lunatic, harum-scarum | a reckless impetuous irresponsible person | |
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harum-scarum, pell-mell | in a wild or reckless manner |