confidential

adjective3

1. •
   secret or private, meant to be known only by a few people and not told to others

   • The newspaper claims a leaked confidential report by the government admits to problems with corrupt MPs.
2. •
   (old-fashioned) Inclined to share confidences; (of things) making people inclined to share confidences; involving the sharing of confidences.

   • Sitting in front of the fire, they became quite confidential, and began to gossip.
3. •
   (old-fashioned) Having someone's confidence or trust; having a position requiring trust; worthy of being trusted with confidences.

   • Now, they want me to send up a confidential person with some writings. — 1819