Writing - another phrase that could replace "goes beyond all bounds of decency"

Solution 1:

beyond the pale

To be 'beyond the pale' is to be unacceptable; outside agreed standards of decency.

-phrases.org

Ex.

"Himmler's conduct had gone beyond the pale, and he could expect no mercy from the Nuremberg court."

I have heard it used in court decisions.

... here no court reporter was used , but without deciding whether the taking of a sworn statement or questionnaire alone ... sworn questionnaire on the same questions , coupled with the anti - union animus present , it went beyond the pale of ...

Solution 2:

Here are quite a few choices, but I suspect many more can be found.

• His/her conduct is unforgivable/unpardonable/inexcusable/unacceptable.
•                                   objectionable beyond compare.
• His/her conduct goes beyond what's acceptable/tolerable.
•                                                         all reasonable limits.
•                                                        all reasonable bounds.
•                                                        the limits of acceptable behaviour. (ref.)
•                                                       the limits of what can be condoned. (ref.)