Examples

白费心思

bother one's head for nothing

既然知道不能成功，你何须再白费力气。

If you know you won't succeed, then why do you continue to waste your energy?

他既然累诫不改，我们也没有必要再白费唇舌了。

Now that he refuses to mend his ways despite of repeated admonition, we needn't waste our breath any more.

你不要白费心思。

Don't strain your brain for nothing.

多年的心血总算没有白费。

All those years of struggle have finally paid off.

白费心机。

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