I picked up this word many years ago while reading Ramsay’s Oration, a speech given in 1730 by the Chevalier de Ramsay, Orator of the “Le Louis d’Argent” Freemason Lodge in Paris, France.

inviolable (in·vi·o·la·ble): / in VAHY uh luh buhl /
adjective

(1) secure from violation, desecration, infringement, violence, or destruction; unbreakable
(2) secure from assault or trespass; unassailable; incorruptible; impregnable

[From Middle English via French from Latin inviolabilis, from Latin violabilis meaning “that may be injured,” from Latin violare meaning “to violate or treat violently.”]

Usage: Evidence shows that the most brutal methods of torture seldom penetrate the inviolable secrecy of the human mind.