Sly
Sly adjective - Clever at attaining one's ends by indirect and often deceptive means.
Under cover and sly are semantically related In some cases you can replace phrase "Under cover" with "Sly", this terms are similar.
Under cover
Mutual synonyms
Cite this Source
Under cover and Sly. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/sly/under_cover
Sly & Under cover. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/sly/under_cover>.
Under cover or Sly. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/sly/under_cover.
Google Ngram Viewer shows how "sly" and "under cover" have occurred on timeline