English to English

adjective (a)

• incapable of being recovered or regained(adj.all)

  Synonym:
  lost, unrecoverable
  Antonym:
  recoverable
  

  source: wordnet30
• Not capable of being recovered, regained, or remedied; irreparable; as, an irrecoverable loss, debt, or injury.(adjective)

  source: webster1913