On the sly
On the sly adverb - In a furtive manner.
Without your knowledge and on the sly are semantically related. In some cases you can use "Without your knowledge" instead an adverb phrase "On the sly".
Without your knowledge
On the sly and without your knowledge are semantically related. You can use "On the sly" instead an adverb phrase "Without your knowledge".
Mutual synonyms
Cite this Source
Without your knowledge and On the sly. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/on_the_sly/without_your_knowledge
On the sly & Without your knowledge. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/on_the_sly/without_your_knowledge>.
Without your knowledge or On the sly. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/on_the_sly/without_your_knowledge.
