Irresponsible
Synonyms: Reckless, careless, incautious, imprudent, ill-considered, misguided, unheeding, hasty, precipitate, wild, impetuous, daredevil, hot-headed, delinquent, remiss, lax, uncaring, insouciant, disregardful, oscitant, naive, hare-brained, carefree, unreliable, untrustworthy, giddy, erratic, harum-scarum, rash, thoughtless, unwise, ill-advised, injudicious, heedless, inattentive, overhasty, precipitous, foolhardy, impulsive, devil-may-care, negligent, neglectful, careless of one's duty, slack, casual, derelict, inadvertent, immature, foolish, feather-brained, blasé, undependable, flighty, scatterbrained, tearaway, and slap-happy.
Example Sentences
His irresponsible actions led to the project's failure.
She made an irresponsible decision to skip the meeting.
Leaving the lights on all night is irresponsible.
He was reprimanded for his irresponsible behavior at work.
It's irresponsible to ignore the safety guidelines.