unretrievable

/ˌʌnrɪˈtriːvəbəl/
adjective
  1. Not able to be recovered, gotten back, or restored.
    • The data on the damaged hard drive was unretrievable.
    • The lost keys seemed unretrievable from the deep lake.
    • Once the letter was burned, the information became unretrievable.
Antonyms
What does "unretrievable" mean? | whatsthatwordmean | whatsthatwordmean