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. adjective
    incapable of being transgressed or dishonored
    “the person of the king is inviolable
    “an inviolable oath”
    Synonyms:
    unassailable, untouchable
    impossible to assail
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    Antonyms:
    violable
    capable of being violated
  2. adjective
    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
  3. adjective
    not capable of being violated or infringed
    synonyms: absolute, infrangible
    inalienable, unalienable
    incapable of being repudiated or transferred to another
  4. adjective
    having to be kept sacred
    synonyms: inviolate, sacrosanct
    sacred
    concerned with religion or religious purposes
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