| furtively(noun, adverb, close, hideaway, arcane) |
| secretly(adverb, close, show, hideaway, arcane) |
| stealthily(noun, adverb, close, hideaway, arcane) |
| surreptitiously(noun, adverb, close, hideaway, arcane) |
| clandestinely(noun, adverb, show, quietly, secretly) |
| latently(adverb, close, hideaway, arcane, stealth) |
| privately(adverb, close, hideaway, arcane, stealth) |
| sub rosa(expression, adverb, show, quietly, secretly) |
| confidentially(adverb, quietly, secretly, personally, privately) |
| hiddenly |
| secretively(adverb, close, hideaway, arcane, stealth) |
| in secret(expression, idiom, adverb, quietly, secretly) |
| on the sly(noun, idiom, adverb, show, quietly) |
| underhandedly(noun, adverb, close, hideaway, arcane) |
| slyly(noun, adverb, secretly) |
| incognito(adverb, close, hideaway, arcane, stealth) |
| invisibly(adverb, invisibly, latently) |
| mysteriously(adverb, secretively) |
| disguisedly |
| huggermugger(adverb, show, secretly) |