inviolable

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
1

adj incapable of being transgressed or dishonored

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

adj immune to attack; incapable of being tampered with

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

adj not capable of being violated or infringed

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

adj having to be kept sacred

Synonyms:
inviolate, sacrosanct
sacred
concerned with religion or religious purposes

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.