Source : Webster's Revised Unabridged Dictionary (1913)

Secretive \Se*cret"ive\, a.
   Tending to secrete, or to keep secret or private; as, a
   secretive disposition.

Source : WordNet®

secretive
     adj : inclined to secrecy or reticence about divulging
           information; "although they knew her whereabouts her
           friends kept close about it" [syn: {close}, {closelipped},
            {closemouthed}, {tightlipped}]