Source : Webster's Revised Unabridged Dictionary (1913)

Indigestibility \In*di*gest`i*bil"i*ty\, n.
   The state or quality of being indigestible; indigestibleness.

Source : WordNet®

indigestibility
     n : the property of being difficult to digest [syn: {indigestibleness}]
         [ant: {digestibility}]