Source : Webster's Revised Unabridged Dictionary (1913)

Secretiveness \Se*cret"ive*ness\, n.
   1. The quality of being secretive; disposition or tendency to
      conceal.

   2. (Phren.) The faculty or propensity which impels to
      reserve, secrecy, or concealment.

Source : WordNet®

secretiveness
     n 1: characterized by a lack of openness (especially about one's
          actions or purposes) [syn: {closeness}] [ant: {openness}]
     2: the trait of keeping things secret [syn: {secrecy}, {silence}]