勞而無功 [劳－无－]

Jyutping lou4 ji4 mou4 gung1
Pinyin láo ér wú gōng

Definitions (CC-CEDICT)
  1. to work hard while accomplishing little
  2. to toil to no avail
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）