adj.不负责任的；不可靠的；没有承担能力的
Nothing can excuse such irresponsible behaviour. 没有理由可以为这样不负责任的行为辩解。
But he turned out to be immature and irresponsible. 但结果他是个不成熟和不负责任的人。
Why can't you just sit and play mah-jongg with the rest of us instead of going out and cavorting with your irresponsible brothers? 你为什麽不坐下来和我们这些人打麻将，而非得出去和你那些不可靠的的弟兄鬼混呢？
