1. entrusted with private information and the confidence of another

- a confidential secretary

Similar word(s): private

2. (of information) given in confidence or in secret

- this arrangement must be kept confidential

Similar word(s): private, secret

3. denoting confidence or intimacy

- a confidential approach

- in confidential tone of voice

Similar word(s): close

4. the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified

Similar word(s): classified

Sentences with confidential as an adjective:

- The newspaper claims a leaked confidential report by the government admits to problems with corrupt MPs.

- Sitting in front of the fire, they became quite confidential, and began to gossip.