The Collaborative International Dictionary of English v.0.48:

Incomprehensive \In*com`pre*hen"sive\, a.
   Not comprehensive; not capable of including or of
   understanding; not extensive; limited. --
   In*com`pre*hen"sive*ly, a. --Sir W. Hamilton. --
   In*com`pre*hen"sive*ness, n. --T. Warton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incomprehensive
    adj 1: not comprehensive [syn: noncomprehensive,
           incomprehensive] [ant: comprehensive]