费力不讨好

fèilìbùtǎohǎo

work hard but get little result; do a hard but thankless job, arduous but fruitless

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fei4 li4 bu4 tao3 hao3

arduous and thankless task (idiom); strenuous and unrewarding

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費力不討好|费力不讨好 [fèi lì bù tǎo hǎo] ► arduous and thankless task (idiom); strenuous and unrewarding