inviolable

Etymology

From Middle French inviolable, from Latin inviolābilis (“untouchable”), from violō (“violate”).

adj

1. Not violable; not to be infringed.
   But honeſt men’s words are Stygian oaths, and promiſes inviolable. a. 1682, Sir Thomas Browne, “Christian Morals”, in Henry Gardiner, editor, Religio Medici, together with a Letter to a Friend on the Death of His Intimate Friend and Christian Morals, London: W. Pickering, published 1845, part III, page 337
   One more request, and I am lost, / If you its earnest prayer deny ; / It is, that you preserve the most / Inviolable secrecy / As to my plan. 1828, Thomas Castaly, “The Recorder”, in Fanny with Other Poems, page 87
   Now, Mr. Jones, having obtained your promise of inviolable secrecy, I come down to the essential point. 1929, Sir Arthur Conan Doyle, When the World Screamed
2. Not susceptible to violence, or of being profaned, corrupted, or dishonoured.
3. Incapable of being injured or invaded; indestructible.