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と議論しても無駄だ

there's no point arguing with

→ と
phrase Rare #33,754
there's no point arguing with The particle と marks the person you argue with. 無駄だ means that something is pointless or futile.
JA: 彼と議論しても無駄だ。
EN: There's no point arguing with him.

彼女と議論しても無駄だ。

There's no point arguing with her.

彼と議論しても無駄だ。

There's no point in arguing with him.

あなたと議論しても無駄だ。

There's no point arguing with you.

そんな馬鹿な奴と議論しても無駄だ。

There's no point arguing with such an idiot.

その事で彼と議論しても無駄だ。

There's no point arguing with him about it.