Confidential | Mean of confidential in English Dictionary

/ˌkɑːnfəˈdɛnʃəl/

• secret or private
1. These documents are completely/strictly confidential.
2. confidential medical records
3. Someone was leaking confidential information [=telling secrets] to the press.
• showing that you are saying something that is secret or private
1. “I have something to tell you,” John said in a confidential tone/voice.
2. Her voice was quiet and confidential.
• trusted with secret or private information
1. She worked as a confidential secretary to the mayor for many years.