離譜 go too far / beyond the pale

On many occasions, the police have beaten up on the protestors without reasons. The police brutalities are beyond pale.

(同義)
go too far -"to behave in a way that upsets or annoys people" Cambridge
cross the line - "to start to behave in a way that is not socially acceptable' Cambridge

References:

beyond the pale - "considered by most people to be unacceptable or unreasonable" Oxford

beyond the pale - "If someone's behaviour is beyond the pale, it is unacceptable". Cambridge

beyond the pale - "offensive or unacceptable" Merriam Webster

beyond the pale - "The phrase "beyond the pale" dates back to the 14th century, when the part of Ireland that was under English rule was delineated by a boundary made of such stakes or fences, and known as the English Pale. To travel outside of that boundary, beyond the pale, was to leave behind all the rules and institutions of English society, which the English modestly considered synonymous with civilization itself". by jim.mcmahon November 30, 2003, Urban Dictionary