Mysterious
Mysterious adjective - Being beyond one's powers to know, understand, or explain.
Sly and mysterious are semantically related. In some cases you can use "Sly" instead an adjective "Mysterious".
Nearby Words: mystery, mysteriously
Sly
Sly adjective - Clever at attaining one's ends by indirect and often deceptive means.
Mysterious and sly are semantically related. Sometimes you can use "Mysterious" instead an adjective "Sly".
Mutual synonyms
Both words in one sentence
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This does see occasional Lampshade Hanging: people on the sly mention all the "mysterious" deaths, and musician Aimee Mann says she hates playing vampire towns.
Source: Weirdness Censor
Cite this Source
Sly and Mysterious. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/mysterious/sly
Mysterious & Sly. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/mysterious/sly>.
Sly or Mysterious. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/mysterious/sly.
Google Ngram Viewer shows how "mysterious" and "sly" have occurred on timeline