Inviolable

Adjective:
1. Incapable of being transgressed or dishonored

Usage:
"the person or the king is inviolable"; "an inviolable oath"

2. Immune to attack; incapable of being tampered with

Usage:
"fortifications that made the frontier inviolable

3. Must be kept sacred

Usage:
"western ethical thinking singled out human life as inviolable

4. Not capable of being violated or infringed

Usage:
"inviolable human rights"

Synonyms:

Absolute
Impregnable
Infrangible
Inviolate
Irrefrangible
Sacrosanct
Secure
Strong
Unassailable
Unattackable