chīㄌㄧˋㄅㄨˋㄊㄠˇtǎoㄏㄠˇhǎo

  1. 許多力氣不但不到回報嫌棄枉費如此盡心做事結果真是吃力不討好。」

arduous and thankless task (idiom)​; strenuous and unrewarding