不锁门是不负责任的！

Leaving the door unlocked was ___irresponsible!

他不负责任的行为引起了很多麻烦。

His ___irresponsible behavior caused a lot of trouble.

你不能总是依赖那些不负责任且粗心的司机。

You can't always rely on drivers who are ___irresponsible and careless.