in-,不，非，effectual,有效的。

1. Teachers often view youth workers as undisciplined and ineffectual.

老师们常认为青少年工作者纪律性差且能力低下。

2. In his view, the Commission remains a toothless and ineffectual body.

在他看来，委员会仍然是一个没有实权、不起作用的机构。

3. Our Intelligence Service was untrained, cumbersome, and almost wholly ineffectual.

我们的情报部门人员缺乏训练，机构臃肿，简直毫无用处。

4. He is a well-meaning but ineffectual leader.

他是个心有余而力不足的领导者。

5. an ineffectual attempt to reform the law

改革法律的徒劳无益的尝试