Confidential (adjective)

1. Meant to be kept secret or private.
2. Having trust or faith in someone.

Origin:

From the late latin confidentialis, meaning "private, intimate," from confidere, meaning "to trust".

Examples:

1. The confidential documents were kept under lock and key.
2. The meeting was confidential and only for employees.
3. I have a confidential relationship with my therapist.
4. The lawyer-client relationship is confidential.
5. The information shared during the therapy session is confidential.