inviolable

(a) incapable of being transgressed or dishonored
- the person of the king is inviolable
- an inviolable oath
(s) immune to attack; incapable of being tampered with
- an impregnable fortress
- fortifications that made the frontier inviolable
- a secure telephone connection
impregnable, unassailable, unattackable, secure, strong,
(s) must be kept sacred sacrosanct, inviolate,
(s) not capable of being violated or infringed
- infrangible human rights
infrangible, absolute,

impregnable unassailable unattackable secure strong sacrosanct inviolate infrangible absolute

violable