irresponsible
/ˌɪɹ.əˈspɑn.sə.bəl/ adjective B2- Lacking a sense of responsibility; performed or acting as though without responsibility; negligent.
From the library
Here sat Marilla Cuthbert, when she sat at all, always slightly distrustful of sunshine, which seemed to her too dancing and irresponsible a thing for a world which was meant to be taken seriously; and here she sat now, knitting, and the table behind her was laid for supper.
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