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もむだだ

it's pointless to

→ も
phrase Rare #31,137
it's pointless to Usually appears as 〜ても無駄だ, meaning that doing something will not help or change the situation. This form is written without a space as てもむだだ in the example sentences.
JA: あなたと言い争ってもむだだ。
EN: There's no point arguing with you.

これについて言い訳してもむだだ。

There's no point making excuses about this.

ケーキを捜してもむだだよ、私が食べちゃったんだから。

There's no point looking for the cake—I ate it.

待ってもむだだ。

There's no point in waiting.

あなたと言い争ってもむだだ。

There's no point arguing with you.