Formal:
* The Constitution guarantees the inviolable right to free speech.
* The sanctity of the voting process is an inviolable principle in a democracy.
* The judge upheld the inviolable contract between the two parties.
Informal:
* My privacy is inviolable, so please don't snoop through my phone!
* The friendship between them was inviolable, through thick and thin.
* Her personal space was inviolable, and she resented anyone who crossed that line.
Literary:
* The ancient temple, its silence inviolable, stood as a testament to a forgotten faith.
* His love for his daughter was an inviolable bond, unbreakable by any adversity.
* The mountain peak, shrouded in mist, held a sense of inviolable mystery.