power的形容词形式无力的

powerless

adj. 无力的；[劳经] 无能力的，无权的；

例句I saw what was happening, but I was powerless to help.

我眼看着事情发生，却无力相助。

It seems hard to believe that we can deal with more serious diseases yet are powerless against something so common as a cold.

让人难以相信的是，我们能够治疗更严重的疾病，却无力对抗像感冒这样常见的疾病。

When the enemy attacked, we were completely powerless against them.

敌人进攻的时候，我们毫无抵御能力。

The bank has done this even though its advisors say the dam will cause hardship for the powerless and environmental destruction.

尽管世界银行的顾问说大坝会给弱势群体带来困难，破坏环境，但世界银行还是这样做了。

Teenagers climbed dozens of flights of stairs to deliver water and food to elderly people trapped in powerless high-rise buildings.

青少年爬上几十层楼梯，给困在高层建筑中无助的老年人送水和食物。

In the end, I felt powerless.

最后，我觉得很无力。