ないほうがいい | Grammar

Structure

[verb ない-form] + ほうがいい [verb ない-form] + ほうがいいです (polite)

Description

The structure ないほうがいい is used to advise someone not to do something. It expresses that it would be better if they refrained from a particular action. It translates to "you had better not…" or "you shouldn't…" in English.

To form it, attach ほうがいい to the plain negative form (ない-form) of the verb:

。

You shouldn't stay up too late.

。

You shouldn't push yourself too hard.

Adding です at the end makes the expression polite without changing the verb form itself:

。

You shouldn't go alone.

Comparison with たほうがいい

While たほうがいい (V[た] + ほうがいい) gives positive advice – recommending someone do something – ないほうがいい gives negative advice – recommending someone not do something.

くすり薬をのんだ飲んだほうがいい – You should take medicine.
くすり薬をのまない飲まないほうがいい – You shouldn't take medicine.

Nuance

ないほうがいい can sound like a mild warning or a gentle suggestion depending on tone and context. It is softer than a direct prohibition like 〜～てはいけない (must not), but it still carries a clear recommendation. It is used among friends, family, or when a speaker genuinely believes the listener would benefit from the advice.

。

You'd better not say things like that.

Examples

。

You shouldn't drink coffee late at night.

、。

You have an early morning tomorrow, so you shouldn't stay up late today.

、。

That store is expensive, so you shouldn't go.

なら、。

If you have a cold, you shouldn't take a bath.

。

You shouldn't play games before the exam.

、。

This road is dark, so you shouldn't walk alone.

。

You shouldn't eat too many sweets.

。

You'd better not talk to him too much.

、。

It looks like it's going to rain, so you'd better not forget your umbrella.

。

You shouldn't tell anyone about that.

なら、。

If you're going to drive, you shouldn't drink alcohol.

、。

It's cold today, so you shouldn't play outside.

References

ないほうがいいBunpro