Source : Webster's Revised Unabridged Dictionary (1913)

Irreparable \Ir*rep"a*ra*ble\, a. [L. irreparabilis: cf. F.
   irr['e]parable. See {In-} not, and {Reparable}.]
   Not reparable; not capable of being repaired, recovered,
   regained, or remedied; irretrievable; irremediable; as, an
   irreparable breach; an irreparable loss. --Shak.

Source : WordNet®

irreparable
     adj : impossible to repair, rectify, or amend; "irreparable harm";
           "an irreparable mistake"; "irreparable damages" [ant: {reparable}]