"confidential" in the adjective sense
1. confidential
entrusted with private information and the confidence of another
"a confidential secretary"
2. confidential, secret
of information) given in confidence or in secret
"this arrangement must be kept confidential"
"their secret communications"
3. confidential
denoting confidence or intimacy
"a confidential approach"
"in confidential tone of voice"
4. confidential
the level of official classification for documents next above restricted and below secret available only to persons authorized to see documents so classified
Source: WordNet® (An amazing lexical database of English)
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