Meaning & usage
ものではない expresses a general rule that an action is improper and should not be done, often based on manners, morals, or common sense. It attaches to the dictionary form of a verb, as in するものではない or 言うものではない. It sounds firm and preachy, so it is used for general principles rather than a casual request to one person. The もの in this pattern is always written in hiragana.
Example sentences 6
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女の子があぐらをかいて座るものではない。
A girl should not sit with her legs crossed.
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夜のこんな時間に電話をかけるものではない。
You ought not to call at this time of night.
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人を見掛けで判断するものではない。
You shouldn't judge a person by his appearance.
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彼にそんな失礼なことを言うものではない。
You shouldn't say such rude things to him.
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人を外見だけで判断するものではない。
You should not judge a person by his appearance alone.
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子供のいる所でそんなことを言うものではない。
You shouldn't say such a thing in the presence of children.
In past JLPT papers
This came up in 2 past exam questions.