ㄨㄤˇwǎngㄈㄟˋfèi

  1. 白費空費··知音虛名枉費辛苦。」儒林外史·第一》:有些想頭不枉一番精神。」白費白搭

to waste (one's breath, one's energy etc)​, to try in vain
dépenser inutilement, gaspiller