not allowed, unacceptable
Вмешательство Рэмона Дюфаэля в чужие дела абсолютно недопустимо!
Ramon Dufayel's meddling in other people's affairs is absolutely unacceptable!
— Амели (2001)
This is completely unacceptable.
Такого рода поведение недопустимо.
This kind of behavior is unacceptable.
This is simply unacceptable.