Correct

为力

/ wéi lì / 
Strokes

Example

As a Verb

put forth one's strength; exert oneself

1
Duìbuqǐ
对不起
  
,
zhè
这
jiàn
件
shì
事
wǒ
我
wúnéngwéilì
无能为力
  
。

I'm sorry I can do nothing about it.