The Collaborative International Dictionary of English v.0.48:

Primitiveness \Prim"i*tive*ness\, n.
   The quality or state of being primitive; conformity to
   primitive style or practice.
   [1913 Webster]

WordNet (r) 3.0 (2006):

primitiveness
    n 1: a wild or unrefined state [syn: crudeness, crudity,
         primitiveness, primitivism, rudeness]