inviolable

adjective

1. 1

   not capable of being violated or infringed

   infrangible human rights

2. 2

   must be kept sacred

3. 3

   incapable of being transgressed or dishonored

   the person of the king is inviolable

   an inviolable oath

4. 4

   immune to attack; incapable of being tampered with

   an impregnable fortress

   fortifications that made the frontier inviolable