| on the quiet(expression, life, reply, unseen, doings) |
| on the sly(expression, idiom, life, reply, unseen) |
| secretly(adverb, show, clandestine, slyly, underhandedly) |
| sub rosa(expression, adverb, show, clandestine, quietly) |
| privately(clandestine, quietly, secretly, personally, slyly) |
| clandestinely(adverb, show, clandestine, quietly, personally) |
| covert |
| covertly(adverb, show, quietly, secretly, personally) |
| furtively(clandestine, quietly, secretly, personally, privately) |
| hugger-mugger |
| huggermugger(adverb, show, secretly) |
| hush-hush(clandestine, quietly, secretly, personally, privately) |
| in camera(expression, clandestine, quietly, secretly, personally) |
| in confidence(expression, quietly, secretly, personally, privately) |
| in holes and corners(expression, idiom, clandestine, quietly, secretly) |
| in strict confidence(expression, idiom, quietly, secretly, personally) |
| insidiously(quietly, secretly, personally, privately, furtively) |
| intimately(quietly, secretly, personally, privately, furtively) |
| obscurely(quietly, secretly, personally, privately, furtively) |
| on the QT(expression, idiom, clandestine, quietly, secretly) |