白費

白费
báifèi
to waste (one's energy etc)

CEDICT

to waste (time, energy, effort, etc.)

Wiktionary

白白浪費

重編國語辭典

无意耗费

維基詞典

Examples

你白費力氣了。

You're barking up the wrong tree.

Source: Tatoeba

他們的努力都白費了。

All their efforts were in vain.

Source: Tatoeba

我们所有的努力都白费了。

All our efforts were in vain.

Source: Tatoeba

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