Usage Note
Inacceptable is invariable in gender for the basic form but agrees in number (inacceptables in the plural). It is slightly more formal and emphatic than inadmissible; in everyday speech it often appears in exclamations ('C'est inacceptable!') to express moral indignation.
Examples
"Ce comportement est totalement inacceptable."
Natural Translation
This behaviour is totally unacceptable.

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