confidential

confidential (http://definr.com/confidential)

     adj 1: entrusted with private information and the confidence of
            another; "a confidential secretary"
     2: (of information) given in confidence or in secret; "closet
        information"; "this arrangement must be kept
        confidential"; "their secret communications" [syn: closet(a),
         secret]
     3: denoting confidence or intimacy; "a confidential approach";
        "in confidential tone of voice"
     4: the level of official classification for documents next
        above restricted and below secret; available only to
        persons authorized to see documents so classified