irresponsible

/ɪɹɪspˈɒnsəbə‍l/

/ˌɪɹəˈspɑnsəbəɫ/

irresponsible

(of a person) not showing or having a good judgment incapable of handling assignments or taking responsibility of any kind

Examples

1. It was so irresponsible of him to leave his children in the car all alone.

2. The company's reputation was damaged when the CEO's irresponsible behavior caused years of hard work to go down the drain.

3. My character is irresponsible.

4. So this alternative was irresponsible.