徒と労ろうに終おわる

expression, godan verb (-ru)

end in vain; prove to be wasted effort

Used when efforts or attempts ultimately yield no result. Often carries a nuance of disappointment or futility.

• 彼かれの努ど力りょくは徒と労ろうに終おわった。

  His efforts ended in vain.

• 長ながい交こう渉しょうも徒と労ろうに終おわった。

  The long negotiations also proved to be wasted effort.