irretrievableadjective
uk/ˌɪr.ɪˈtriː.və.bəl/us/ˌɪr.əˈtriː.və.bəl/impossible to correct or return to a previously existing situation or condition:
I agree things look difficult, but the situation is far from irretrievable.
 The couple separated on the grounds of irretrievable breakdown (of their marriage).
Thesaurus: synonyms and related words
Not able to be changed
- a leopard can't/doesn't change its spots idiom
 - be no hard and fast rules idiom
 - burn your boats/bridges idiom
 - congenital
 - continuity
 - fixed
 - fixity
 - hard line
 - hard line
 - immutable
 - incurable
 - irredeemable
 - irreducible
 - irremediable
 - irreparable
 - irreversible
 - ossify
 - stuck
 - uncompromising
 - what's done is done idiom
 
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irretrievably  
adverb uk/ˌɪr.ɪˈtriː.və.bli/us/ˌɪr.əˈtriː.və.bli/
irretrievably damaged/lost