◎勞而無(wú)功
[bay the moon;work hard but to no avail;accomplish little; fool's errand; milk the bull; preach to the winds wash a blackamor white] 費了力氣但沒(méi)收到成效
與不可，強不能，告不知，謂之勞而無(wú)功?！?span id="qa6qcoqe46" class="bold">《管子·形勢》
(好工具)花費了精力，卻毫無(wú)功效或收獲?！肚f子．天運》：「今蘄行周于魯，是猶推舟于陸也，勞而無(wú)功?！埂秴问洗呵铮⑿杏[．本味》：「求之其本，經(jīng)旬必得；求之其末，勞而無(wú)功?！挂沧鳌竿絼跓o(wú)功」。