Meaning & usage
ものではない expresses a strong general denial that something is not true, cannot be done, or should not be done. It is often used with 決して to reject an idea completely or to state a social rule or impossibility. It follows the dictionary form or ない-form of verbs, including potentials like できる, as in 許されるものではない or 座るものではない, and follows i-adjectives directly, na-adjectives with な, and nouns with という. The tone is formal and emphatic.
Example sentences 3
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彼の提案は受け入れられるものではなかった。
His proposal was not acceptable.
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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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外国語は1年やそこらで身につけられるものではない。
A foreign language cannot be mastered in a year or so.
In past JLPT papers
This came up in 4 past exam questions.