Definition of irretrievably adverb from the Oxford Advanced Learner's Dictionary

 

irretrievably

 adverb
adverb
BrE BrE//ˌɪrɪˈtriːvəbli//
 
; NAmE NAmE//ˌɪrɪˈtriːvəbli//
 
(formal)
 
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in a way that means you can never make something right or get it back Some of our old traditions are irretrievably lost.