irresponsibly
US /ˌɪr.əˈspɑːn.sə.bli/
UK /ˌɪr.əˈspɑːn.sə.bli/
1.
secara tidak bertanggung jawab
in a way that shows that you are not thinking or worrying enough about the possible results of what you do:
:
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It's unlike you to behave so irresponsibly.