irrevokable

/ɪˈrɛvəkəbəl/
adjective
  1. Not able to be changed, reversed, or undone; final.
    • The judge's decision was irrevokable, so there was no point in appealing.
    • Once you sign the contract, the agreement becomes irrevokable.
    • The damage to the ancient monument was irrevokable after the earthquake.
Antonyms