Even though 'inviolable' suggests something strong, it's often used in a symbolic or moral sense, not physical. The inviolable nature of one's personal freedom is a philosophical concept.
Pro Tip 2/3
Severity of Violation
'Inviolable' implies that any breach is considered extremely serious, not just a minor infraction. An inviolable ceasefire means no violations are tolerated, not even small ones.
Pro Tip 3/3
Unchanging State
'Inviolable' can describe something that remains unchanged over time, resisting any alteration. The inviolable traditions of our ancestors are still followed to this day.