The Collaborative International Dictionary of English v.0.48:

Irrecoverable \Ir`re*cov"er*a*ble\, a.
   Not capable of being recovered, regained, or remedied;
   irreparable; as, an irrecoverable loss, debt, or injury.
   [1913 Webster]

         That which is past is gone and irrecoverable. --Bacon.

   Syn: Irreparable; irretrievable; irremediable; unalterable;
        incurable; hopeless. -- Ir`re*cov"er*a*ble*ness, n. --
        Ir`re*cov"er*a*bly, adv.
        [1913 Webster]