On the sly
On the sly adverb - In a furtive manner.
Unauthorised and on the sly are semantically related. In some cases you can use "Unauthorised" instead an adjective phrase "On the sly".
Unauthorised
Unauthorised adjective - Not endowed with authority.
On the sly and unauthorised are semantically related. Sometimes you can use "On the sly" instead an adjective "Unauthorised".
Nearby Word: unauthorized
Mutual synonyms
Cite this Source
Unauthorised and On the sly. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/on_the_sly/unauthorised
On the sly & Unauthorised. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/on_the_sly/unauthorised>.
Unauthorised or On the sly. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/on_the_sly/unauthorised.
