Irresponsible synonyms such as careless of one's duty, blasé, and carefree. Irresponsible is an adjective, and its antonyms are responsible, sensible, and serious. Additionally, here are 57 synonyms, related words, and verbs for irresponsible.
Blasé, carefree, careless, careless of one's duty, casual, daredevil, delinquent, derelict, devil-may-care, disregardful, erratic, feather-brained, flighty, foolhardy, foolish, giddy, hare-brained, harum-scarum, hasty, heedless, hot-headed, ill-advised, ill-considered, immature, impetuous, imprudent, impulsive, inadvertent, inattentive, incautious, injudicious, insouciant, lax, misguided, naive, neglectful, negligent, oscitant, overhasty, precipitate, precipitous, rash, reckless, remiss, scatterbrained, slack, slap-happy, tearaway, thoughtless, uncaring, undependable, unheeding, unreliable, untrustworthy, unwise, and wild.