The Collaborative International Dictionary of English v.0.48:

Incompleteness \In`com*plete"ness\, n.
   The state of being incomplete; imperfectness; defectiveness.
   --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incompleteness
    n 1: the state of being crude and incomplete and imperfect; "the
         study was criticized for incompleteness of data but it
         stimulated further research"; "the rawness of his diary
         made it unpublishable" [syn: incompleteness, rawness]
         [ant: completeness]