irresponsibly
US /ˌɪr.əˈspɑːn.sə.bli/
UK /ˌɪr.ɪˈspɒn.sə.bli/
副詞
無責任に
in a way that shows that you are not thinking or worrying enough about the possible results of what you do:
例:
•
It's unlike you to behave so irresponsibly.