やらないよ

won't do it

→ 遣る
phrase Rare #28,694
won't do it A casual way to state that you or someone else will not do something. The subject and object are often understood from context; よ adds emphasis.
JA: 今日はもうやらないよ。
EN: I’m not doing it anymore today.

トムは奥さんの許可なしでは何もやらないよ。

Tom doesn't do anything without his wife's permission.

私の友達は誰もゴルフやらないよ。

None of my friends play golf.

もうやらないよね?

You’re not going to do it again, are you?

— バーフバリ 伝説誕生 (2015)

今日、それはやらないよ。

I'm not doing that today.

やらないよ

I'm not going to.

— 最強のふたり (2011)

もう二度とやらないよ。

I'll never do it again.

トムはこんなのやらないよ。

Tom wouldn't do something like this.