1. He is an irresponsible cadre.
    他是个不负责任的干部。

2. You forget everything, and sometimes you become careless and irresponsible.
    你把什么都忘记掉，而且有时你会变得粗心大意和不负责任。

3. It seems that the ability to delay reward is a master skill, a triumph of the logical brain over the irresponsible one.
    看来似乎能耐心等待收益的能力是最重要的技巧。这里，逻辑性强的思考战胜了不负责任的思考。