Open English Wordnet
Adjectives
(s)confidentialentrusted with private information and the confidence of another“a confidential secretary”
(s)confidential, secret(of information) given in confidence or in secret“this arrangement must be kept confidential”, “their secret communications”
(s)confidentialdenoting confidence or intimacy“a confidential approach”, “in confidential tone of voice”
(s)confidentialthe level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified