費力不討好

Simplified: 费力不讨好

fèilìbùtǎohǎo ㄈㄟˋ ㄌㄧˋ ㄅㄨˋ ㄊㄠˇ ㄏㄠˇ

    • arduous and thankless task (idiom) strenuous and unrewarding

Character by character

Sources