New answers tagged nouns
2
Yes it is possible. Perhaps it's not clear to you because you are using the formal form, ではありません, and that form cannot be used to modify nouns.
If you were to change to the informal ではない or じゃない then things start to look rather like the i-adjective case, right?
これは簡単{かんたん}じゃない問題{もんだい}です。
This is a problem which is not simple.
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