in-,不，非，effective,有效的。

1. This is an ineffective method of controlling your dog.

用这种方法控制你的狗不起作用。

2. If they prove ineffective they should be demoted or asked to retire.

如果事实证明他们已无力胜任，应该将他们降级或让他们退休。

3. Economic reform will continue to be painful and ineffective.

经济改革仍将举步维艰，毫无成效。

4. An all-female political section would have been operationally ineffective.

一个由清一色的女性组成的政治部门工作起来将会毫无效率可言。

5. The new drug was ineffective.

新药不起作用。