N2 Assertion, Likelihood, and Norms

~ものではない: meaning, usage and examples

~ものではない means: should not... / must not...

Updated 9 November 2026 · By the My Senpai team · Spotted a mistake? Tell us

Examples

1. 人前ひとまえで、そんなことを言いうものではない。

   You shouldn't say such things in front of people.

2. 子供こどもを叱しかるときに、感情的かんじょうてきになるものではない。

   You shouldn't get emotional when scolding children.

3. 人ひとの悪口わるぐちを言いうものではない。

   You should not speak ill of others.

4. 食事しょくじ中ちゅうに、スマホばかり見みるものではありません。

   You should not keep looking at your phone during meals.

When to use it

Use ものではない to say that something is not proper or not acceptable by common sense or manners. It is a way of warning or scolding, as in 人ひとの悪口わるぐちを言いうものではない (you should not speak ill of others). It often follows a situation the speaker has just seen.

Nuance

Often used by parents, teachers or seniors toward children or juniors, so it sounds like a lecture. It presents the rule as common sense, not personal opinion. Not used toward superiors, and not for the speaker's own actions.

Compare

べきではない gives the speaker's own personal opinion about right and wrong: 行いくべきではない. ものではない appeals to common sense and manners: 人前ひとまえでそんなことを言いうものではない. てはいけない is a direct prohibition based on a rule, not on manners: ここで写真しゃしんを撮とってはいけない.

Tip: Imagine a grandparent saying it. If the sentence sounds like a manners lesson, ものではない fits.