Confidentially Synonyms and Antonyms

In secret
(Adverb)
Synonyms:
  1. between-you-and-me
  2. entre nous
Antonyms:
  1. commonly
  2. familiarly
  3. publicly
  4. openly
Synonyms:
(Adjective)
  1. privately
  2. personally
  3. in-confidence