| not for publication(expression, idiom, adverb, sensitive, confidential) |
| obscurely(adverb, quietly, secretly, personally, privately) |
| on the QT(expression, idiom, adverb, sensitive, confidential) |
| on the quiet(expression, idiom, adverb, quietly, personally) |
| on the sly(expression, idiom, adverb, quietly, personally) |
| ourselves |
| personally(adverb, quietly, secretly, privately, slyly) |
| privately(adverb, quietly, secretly, personally, slyly) |
| privily(adverb, quietly, secretly, personally, privately) |
| quietly(adverb, secretly, personally, privately, furtively) |
| secretly(adverb, slyly, confidentially, surreptitiously) |
| slyly(adverb, quietly, secretly, personally, privately) |
| stealthily(adverb, quietly, secretly, personally, privately) |
| strict |
| sub rosa(expression, adverb, quietly, secretly, personally) |
| surreptitiously(adverb, quietly, secretly, personally, privately) |
| under the table(expression, idiom, adverb, quietly, personally) |
| underhandedly(adverb, quietly, secretly, personally, privately) |
| unobserved(adverb, quietly, secretly, personally, privately) |
| unofficial(adverb, sensitive, confidential, eyes-only) |