Such that it cannot be digested.

A condition of heartburn, nausea, etc. most often caused by eating too quickly.

The state of being indigestible.

Difficult or impossible to digest. / (by extension) Difficult to accept; unpalatable.

Anything that is difficult to digest.

plural of indigestion

(now rare) Not resolved; not regularly disposed and arranged; unmethodical, crude. / Not digested in the stomach; undigested.

indigestibility; the quality of being indigestible.

plural of indigest

(obsolete) crude; unformed; unorganized; undigested