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無駄だよ

it's useless

→ 無駄だ
phrase Uncommon #17,818
it's useless Used to tell someone that an action will not help or achieve anything. よ adds emphasis and makes the statement sound conversational; 無駄 can also be translated as “no use” in this pattern.
JA: 今から急いでも無駄だよ。
EN: There’s no use hurrying now.

この車は修理するだけ無駄だよ。

There's no point in repairing this car.

そんなの無駄だよ。

That's a waste of time.

無駄だよ。

It's pointless.

何をやっても無駄だよ。

Whatever you do, it’s pointless.

もう一度やってみたところで無駄だよ。

There’s no point in trying again.

俺なんかどうせやっても無駄だよ。

There's no point in someone like me even trying.