Wedding vows and vault combinations that can’t be broken are considered inviolable. (Of course, divorce lawyers and bank robbers consider this a challenge.)

The word can refer to a physical structure (a fortress, for instance) or something more conceptual (human rights or morals, perhaps). Inviolable has changed little from its Latin origin of inviolabilis, which combines the prefix in- (meaning "not") with the verb violare ("to violate"). Inviolable turns up in religious settings too, usually in reference to texts or rites. In that context, it means "sacred." No surprise: the antonym of inviolable is violable ("accessible or penetrable").

Definitions of inviolable

adj incapable of being transgressed or dishonored

“the person of the king is inviolable
“an inviolable oath”
unassailable, untouchable
impossible to assail
capable of being violated

adj immune to attack; incapable of being tampered with

“fortifications that made the frontier inviolable
impregnable, secure, strong, unassailable, unattackable
immune to attack; impregnable

adj not capable of being violated or infringed

absolute, infrangible
inalienable, unalienable
incapable of being repudiated or transferred to another

adj having to be kept sacred

inviolate, sacrosanct
concerned with religion or religious purposes

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