しない方がいいよ

you'd better not

→ 為る
phrase Rare #25,227
you'd better not A casual way to advise someone not to do something. The pattern ~ない方がいい means “it’s better not to ~,” and よ adds emphasis.
JA: そんなに無理しない方がいいよ。
EN: You'd better not push yourself too hard.

間食はしない方がいいよ

You’d better not snack between meals.

今夜はあまり夜更かししない方がいいよ

You shouldn’t stay up too late tonight.

化粧しない方がいいよ

You’d look better without makeup.

車の運転しない方がいいよ

You’d better not drive.

期待しない方がいいよ

You shouldn't get your hopes up.

この仕事をしない方がいいよ

You shouldn't do this job.

ここでその話はしない方がいいよ

You probably shouldn't talk about that here.