もムダ

it’s no use

→ も
phrase Common #3,050
it’s no use Usually follows a verb in the て-form, as in しても無駄, meaning that doing something is futile.
JA: 探してもムダだよ。
EN: There’s no use looking for it.

神に祈ってもムダ

There's no point in praying to God.

— シカゴ (2002)

言ってもムダだ

There's no point in saying it.

— シティ・オブ・ゴッド (2002)

助けを呼んでもムダだ

There's no use calling for help.

— ほんとうのピノッキオ (2019)

今から行ってもムダだ

There’s no point in going now.

— 自転車泥棒 (1948)

海の向こうに逃げてもムダだ必ず見つける

Even if you flee across the sea, it’s useless—I’ll find you no matter what.

— ほんとうのピノッキオ (2019)

不満とか――文句を言ってもムダ

There’s no point in complaining or voicing your dissatisfaction.

— シカゴ (2002)

それが妻や恋人にいくら教えてもムダ

There's no point in telling your wife or girlfriend about it, no matter how many times you try.

— Carandiru (2003)

止めてもムダ

There's no point in trying to stop me.

— パディントン2 (2017)

ごまかしてもムダだぞ

There's no point trying to deceive me.

— ほんとうのピノッキオ (2019)