Open English Wordnet
Adjectives
(a)inviolableincapable of being transgressed or dishonored“the person of the king is inviolable”, “an inviolable oath”
(s)impregnable, inviolable, secure, strong, unassailable, unattackableimmune to attack; incapable of being tampered with“an impregnable fortress”, “fortifications that made the frontier inviolable”, “a secure telephone connection”
(s)absolute, infrangible, inviolablenot capable of being violated or infringed“infrangible human rights”