ir ‧ rev ‧ o ‧ ca ‧ ble /ɪˈrevəkəb ə l/ BrE AmE adjective
[ Date: 1300-1400 ; Language: Latin ; Origin: irrevocabilis , from revocare ; ⇨ ↑ revoke ]
an irrevocable decision, action etc cannot be changed or stopped:
Think about the situation carefully before you take an irrevocable step.
—irrevocably adverb :
machines that irrevocably changed the pattern of rural life