| privately(adverb, secretly, confidentially) |
| in camera |
| aside |
| confidentially(adverb, secretly) |
| off the record(expression, adjective, idiom, adverb, secret) |
| personally(adverb, secretly, confidentially) |
| private(mysterious, secret, reticent, confidential) |
| secretly(adverb, confidentially) |
| apart |
| backstairs(mysterious, private, reticent, taciturn, covert) |
| behind closed doors(expression, idiom, adverb, secretly, confidentially) |
| buttoned up(expression, mysterious, private, reticent, taciturn) |
| cagey(mysterious, private, reticent, taciturn, covert) |
| clammed up(expression, mysterious, private, reticent, taciturn) |
| clandestinely |
| close(mysterious, private, reticent, taciturn, uncommunicative) |
| close-mouthed(mysterious, private, reticent, taciturn, uncommunicative) |
| covert(mysterious, private, reticent, taciturn, uncommunicative) |
| covertly(adverb, secretly, confidentially) |
| cryptic(mysterious, private, reticent, taciturn, covert) |