irresponsible

It was irresponsible of him to leave the campfire burning while everyone was asleep.

(Chinese) 在大家都睡觉时还让营火燃着，他这种行为是不负责任的。

An irresponsible driver who speeds through red lights puts everyone on the road in danger.

(Chinese) 一名闯红灯超速的不负责任的司机让路上的每一个人都处于危险之中。