irrevocable
adjective
uk/ɪˈrevəkəbl/ usimpossible to change:
The judge said that the option was an irrevocable offer by the owner to sell.
The irrevocable loan facility agreed today has a term of 15 years.
irrevocably
adverb /ɪˈrevəkəbli/
What happens in the next two years may irrevocably shape the administration of whichever candidate is elected president.