/ ˌɪrɪˈtriːvəbl; NAmE / adjective
( formal ) that you can never make right or get back :
an irretrievable situation
the irretrievable breakdown of the marriage
The money already paid is irretrievable.
OPP retrievable
► ir·re·triev·ably / -əbli; NAmE / adverb :
Some of our old traditions are irretrievably lost.