IPA: /ˌɪrɪˈtrivəbl/
KK: /ˌɪrɪˈtrivəbl/
Something that cannot be recovered or brought back, often referring to loss or damage that cannot be fixed.
After the data was deleted, it was irretrievable and could not be restored.
Irretrievable → It is formed from "in-" (meaning not), "retrievable" (from Latin "retrahere", meaning to draw back). The word describes something that cannot be drawn back or recovered.
Think of something that cannot be 'drawn back' ('retrievable') — the 'in-' means not, so irretrievable means it cannot be recovered.