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1. Immune to attack; incapable of being tampered with
   "fortifications that made the frontier inviolable";
   - impregnable, secure, strong, unassailable, unattackable
    
2. Must be kept safe, held in respect and free from violation or damage
   "Western ethical thinking singled out human life as inviolable";
   - inviolate, sacrosanct
    
3. Not capable of being violated or infringed
   "inviolable human rights";
   - absolute, infrangible
    
4. Incapable of being transgressed or dishonoured
   "the person of the king is inviolable"; "an inviolable oath";
   - irrefrangible

See also: inalienable, invulnerable, sacred, unalienable, unassailable, untouchable

Antonym: violable

Encyclopedia: Inviolable