Source : Webster's Revised Unabridged Dictionary (1913)

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

         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.

Source : WordNet®

irrecoverable
     adj : incapable of being recovered or regained [syn: {unrecoverable}]
           [ant: {recoverable}]