inadmissible, unacceptable
Votre requête pour quitter Berlin est absolument inadmissible !
Your request to leave Berlin is absolutely unacceptable!
— La Chute (2004)
That's unacceptable.
Son comportement est inadmissible.
His behavior is unacceptable.
Cette attitude est inadmissible !
This attitude is unacceptable!
Votre attitude est inadmissible !
Your attitude is unacceptable!
This is unacceptable.