confidential

entrusted with private information and the confidence of another

• “a confidential secretary”

(of information) given in confidence or in secret

• “closet information”
• “this arrangement must be kept confidential”
• “their secret communications”

denoting confidence or intimacy

• “a confidential approach”
• “in confidential tone of voice”

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