secretiveness
  隱藏的
  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.
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  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]