Synonyms of 'confidentially'
Confidentially, I am not sure they knew what was happening.
Dan found out that I'd been meeting my ex-boyfriend in secret.
He will see the Prime Minister privately on Thursday.
Personally he was quiet, modest and unobtrusive.
behind closed doors
I'm telling you all these things in confidence.
sub rosa (literary)
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Thesaurus for confidentially from the Collins English Thesaurus
Confidentially is used to say that what you are telling someone is a secret and should not be discussed with anyone else.