/ ˌkɒnfɪˈdenʃl; NAmE ˌkɑːn-/ adjective
1.
meant to be kept secret and not told to or shared with other people :
confidential information / documents
Your medical records are strictly confidential (= completely secret) .
2.
( of a way of speaking ) showing that what you are saying is private or secret :
He spoke in a confidential tone, his voice low.
3.
[ only before noun ] trusted with private or secret information :
a confidential secretary
► con·fi·den·tial·ly / -ʃəli; NAmE / adverb :
She told me confidentially that she is going to retire early.