Adjective
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"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