adj.不負(fù)責(zé)任的；不可靠的；沒(méi)有承擔(dān)能力的

Nothing can excuse such irresponsible behaviour. 沒(méi)有理由可以為這樣不負(fù)責(zé)任的行為辯解。

But he turned out to be immature and irresponsible. 但結(jié)果他是個(gè)不成熟和不負(fù)責(zé)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? 你為什麼不坐下來(lái)和我們這些人打麻將，而非得出去和你那些不可靠的的弟兄鬼混呢？