i Register
In some senses, irresponsible is marked as archaic. Watch for register when choosing this word.
irresponsible
UK /ˌɪɹ.ɪˈspɒn.sə.bəl/ US /ˌɪɹ.əˈspɑn.sə.bəl/
adj 2noun 1
Definitions
adj
1
Not responsible; exempt from legal responsibility, not to be held accountable.
They left the crown what, in the eye and estimation of law, it had ever been, perfectly irresponsible.
2
Lacking a sense of responsibility; performed or acting as though without responsibility; negligent.
noun
1
Someone who is not responsible.
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