Definition of irretrievable adjective from the Oxford Advanced American Dictionary

 

irretrievable

 adjective
adjective
NAmE//ˌɪrɪˈtrivəbl//
 
(formal)
 
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that you can never make right or get back an irretrievable situation the irretrievable breakdown of the marriage The money already paid is irretrievable.
irretrievably
 
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NAmE//ˌɪrɪˈtrivəbli//
 
adverb Some of our old traditions are irretrievably lost.
See the Oxford Advanced Learner's Dictionary entry: irretrievable