1
infructuosamente;ineficazmente;en vano;a lo tonto;para nada;en balde;inutilidad;futilidad
1
futility;waste;uselessness;pointlessness;idleness
今更後悔しても無駄だ。
It's no use regretting it now.
Other forms
徒 【むだ】 (rarely used kanji form)