Jisho

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でない could be an inflection of だ, with these forms:
  • Nai-form. It indicates the negative form of the verb.

Searched for でない. You can also try a search for "denai".

Words — 2 found

でない
Show inflections Links
Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
1. is not; am not; are not​Usually written using kana alone, negation of である
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でなければ
Common word Links
Expressions (phrases, clauses, etc.)
1. without; but if; otherwise; or else​
Other forms
でないと
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Names — 1 found

ドナン
Place
1. Denain (France); Donaint; Donnan​