| behind closed doors(expression, idiom, adverb, confidence, personally) |
| between ourselves(expression, adverb, confidence, secretly, personally) |
| between us(expression, adverb, secretly, personally, privately) |
| confidentially(adverb, confidence, secretly) |
| in confidence(expression, adverb, secretly, personally, privately) |
| in on the ground floor(expression, idiom, adverb, secretly, personally) |
| in secret(expression, adverb, secretly, personally, privately) |
| off the cuff(expression, idiom, adverb, secretly, personally) |
| off the record(expression, idiom, adverb, confidence, personally) |
| privately(adverb, confidence, secretly, personally, confidentially) |
| sub rosa(expression, adverb, secretly, personally, privately) |
| behind the scenes |
| covertly(adverb, secretly, personally, privately, confidentially) |
| don't breathe a word(adverb, confidence) |
| entre nous |
| hushedly(adverb, secretly, personally, privately, confidentially) |
| in private(expression, secretly, confidentially) |
| personally(adverb, secretly, privately, confidentially) |
| secretly |