confidential - definition and synonyms

 
adjective 

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/ˌkɒnfɪˈdenʃ(ə)l/
  1. 1
    confidential documents or information must be kept secret
    strictly/highly confidential:

    The reports are treated as strictly confidential.

  2. 2
    showing that what you are going to say must be kept secret

    His confidential manner led me to expect important news.