irresponsible
adjectiveUK /ˌɪrɪˈspɒnsəbl/
US /ˌɪrɪˈspɑːnsəbl/
Not doing the things you should do, or not thinking about what might happen.
It was irresponsible of him to leave the gate open.
OTHER MEANINGS
2. Not showing a proper sense of duty or care toward others.
She was criticized for her irresponsible attitude toward her team.
3. Done without thinking about the possible bad results.
Driving without a seatbelt is an irresponsible choice.
4. Not able to be trusted to do what is right or expected.
The company was accused of irresponsible spending.