ADJECTIVE (2)

1. not thought over and arranged systematically in the mind; not absorbed or assimilated mentally;
- Example: "an undigested mass of facts gathered at random"

2. not digested;
- Example: "undigested food"

The Collaborative International Dictionary of English v.0.48:

Undigested \Undigested\
   See digested.

WordNet (r) 3.0 (2006):

undigested
    adj 1: not thought over and arranged systematically in the mind;
           not absorbed or assimilated mentally; "an undigested mass
           of facts gathered at random"
    2: not digested; "undigested food"