One of the mysteries of the English language finally explained.
1‘such irresponsible behaviour will not be tolerated’
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
North American derelict
rare disregardful, inadvertent, oscitant
2‘if Rose wants to behave like an irresponsible teenager, that's her affair’
immature, naive, foolish, hare-brained, feather-brained
unreliable, undependable, untrustworthy, flighty, giddy, scatterbrained, erratic
informal harum-scarum, slap-happy
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