"inviolable" in the adjective sense
1. inviolable
incapable of being transgressed or dishonored
"the person of the king is inviolable"
"an inviolable oath"
2. impregnable, inviolable, secure, strong, unassailable, unattackable
immune to attack incapable of being tampered with
"an impregnable fortress"
"fortifications that made the frontier inviolable"
"a secure telephone connection"
3. inviolable, inviolate, sacrosanct
must be kept sacred
4. absolute, infrangible, inviolable
not capable of being violated or infringed
"infrangible human rights"
Source: WordNet® (An amazing lexical database of English)
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