Synonym: off the record, secret. Similar words: confidentiality, confident, confidence, residential, presidential, confide, credentials, consequential. Meaning: [‚kɒnfɪ'denʃəl] 
adj. 1. entrusted with private information and the confidence of another 2. (of information) given in confidence or in secret 3. denoting confidence or intimacy 4. the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified.
adj. 1. entrusted with private information and the confidence of another 2. (of information) given in confidence or in secret 3. denoting confidence or intimacy 4. the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified. 
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31) I'd be obliged if you'd treat this matter as strictly confidential.
32) The plan has to remain confidential at least until the local elections are out of the way.
33) How was I to know that the file was confidential?
34) I need hardly remind you that this information is confidential.
35) An anonymous tipster has leaked confidential government information to the press.
36) We'll take good care and keep what you've told us strictly confidential[sentencedict.com/confidential.html], Mr. Lane.
37) We have certain reasons for our decision, which have to remain confidential.
38) We tried our best to head Henry off the topic, because we knew he'd reveal confidential information.
39) The charity says the journalists appear to have obtained confidential documents in an unorthodox manner.
40) The two parties encode confidential data in a form that is not directly readable by the other party.
41) This is confidential, but I know that I can rely on your discretion.
42) Police are investigating the disappearance from council offices of confidential files.
43) He refused to allow his secretary to handle confidential letters.
44) From time to time he passed on confidential information to him.
45) The source of the information is irrelevant. Moreover, the information need not be confidential.
46) She was accused of disclosing confidential material to a competitor.
47) I must stress that everything I've told you is strictly confidential.
48) "Look," he said in a confidential tone[sentencedict.com], "I want you to know that me and Joey are cops.".
49) The first concerns the definition of confidential information.
50) The questionnaire itself is strictly confidential.
51) He says that it is a confidential document.
52) Another confidential royal servant, however, fared less well.
53) Why is the medical report to remain confidential?
54) He has his confidential sources of information.
55) Specific terms are being kept confidential, the lawyer said.
56) And you expect me to keep that confidential.
57) We hold confidential records on each employee.
58) What I'm telling you is strictly confidential.
59) Judge Nisen disallowed certain evidence containing confidential information.
60) All the information will be confidential.
More similar words: confidentiality, confident, confidence, residential, presidential, confide, credentials, consequential, inconsequential, diffident, diffidently, confinement, sequential, essential, potential, tangential, potentially, essentially, identity, identify, deferential, influential, inessential, identical, pestilential, preferential, deferentially, essentiality, existentialism, identical twin.