The Collaborative International Dictionary of English v.0.48:
Indigestibility \In*di*gest`i*bil"i*ty\, n. The state or quality of being indigestible; indigestibleness. [1913 Webster]WordNet (r) 3.0 (2006):
indigestibility n 1: the property of being difficult to digest [syn: indigestibility, indigestibleness] [ant: digestibility, digestibleness]