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Irretrievable
Non-reversible Actions
Use 'irretrievable' when an action cannot be undone, often leading to serious consequences. 
Finality and Loss
'Irretrievable' often implies a sense of final loss, something that cannot come back. 
Strong Emotion
'Irretrievable' can convey strong emotions, often of regret or sorrow, about the lost item or opportunity. 