Sly
Sly adjective - Clever at attaining one's ends by indirect and often deceptive means.
Unauthorized and sly are semantically related. In some cases you can use "Unauthorized" instead an adjective "Sly".
Unauthorized
Unauthorized adjective - Not endowed with authority.
Sly and unauthorized are semantically related. Sometimes you can use "Sly" instead an adjective "Unauthorized".
Nearby Word: unauthorised
Mutual synonyms
Cite this Source
Unauthorized and Sly. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/sly/unauthorized
Sly & Unauthorized. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/sly/unauthorized>.
Unauthorized or Sly. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/sly/unauthorized.
Google Ngram Viewer shows how "sly" and "unauthorized" have occurred on timeline