unalterable

comparative more unalterable · superlative most unalterable

1. Incapable of being altered, or of changing.

   ... every statute in the Bible and in the law books is an attempt to defeaat a law of God—in other words an unalterable and indestructible law of nature.

   c. 1909, Mark Twain, Letters from the Earth, Letter VIII

   2 more examples

   People of unalterable ideas still insisted upon calling him "Sergeant" when they met him, which was in some degree owing to his having still retained the well-shaped moustache of his military days, and the soldierly bearing inseparable from his form.

   1874, Thomas Hardy, “Coming Home—A Cry”, in Far from the Madding Crowd. […], volume II, London: Smith, Elder & Co., […], →OCLC, pages 99–100

   For instance, we’d need to make one of the following assumptions: (1) that the system will be programmed with an unalterable goal preservation meta-goal, (2) that the training process would select for such a meta-goal, or (3) that the adoption of the meta-goal itself is instrumentally convergent.

   2025 June 13, Rhys Southan, Helena Ward, Jen Semler, “A timing problem for instrumental convergence”, in Philosophical Studies, Springer Science+Business Media, →DOI, →ISSN, →OCLC

2. Irreversible, irrevocable.