reckless, rash, careless, thoughtless, incautious, unwise, imprudent, ill-advised, ill-considered, injudicious, misguided, heedless, unheeding, inattentive, hasty, overhasty, precipitate, precipitous, wild, foolhardy, impetuous, impulsive, daredevil, devil-may-care, hot-headed, negligent, delinquent, neglectful, remiss, careless of one's duty, lax, slack, uncaring, casual, insouciant
immature, naive, foolish, hare-brained, feather-brained
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