On the sly and Sub-rosa

On the sly adverb - In a furtive manner.

Sub-rosa and on the sly are semantically related in sneaky topic. In some cases you can use "Sub-rosa" instead the phrase "On the sly" as an adjective or an adverb.

Sub-rosa adjective - Designed and carried out secretly or confidentially.

On the sly and sub-rosa are semantically related in sneaky topic. Sometimes you can use "On the sly" instead the phrase "Sub-rosa" as an adjective or an adverb.