Source : Webster's Revised Unabridged Dictionary (1913)

Irreprovable \Ir`re*prov"a*ble\, a.
   Incapable of being justly reproved; irreproachable;
   blameless; upright. -- {Ir`re*prov"a*ble*ness}, n. --
   {Ir`re*prov"a*bly}, adv.