idiom > waste distract
Contents
枉费心思
Pinyin: wǎng fèi xīn sī

Explanation: 指白费心思。同枉费心机”。

With the "vain"
　　With the "futile."
　　Rou Shi, "February": "Mr. Hsiao is to admire, but wasted thoughts."
Translated by Google