inviolable

Meanings

• incapable of being transgressed or dishonored
  • "the person of the king is inviolable"
  • "an inviolable oath"
• immune to attack; incapable of being tampered with
  • "fortifications that made the frontier inviolable"
• must be kept sacred
• not capable of being violated or infringed

Synonyms

absolute, impregnable, infrangible, inviolate, sacrosanct, secure, strong, unassailable, unattackable