| plausible(false, misleading, illusory) | |
| profound(sharp, smart, intelligent, cunning, clever) | |
| quiet | |
| rascally | |
| reserved | |
| savvy(adjective, smooth, keen, sharp, smart) | |
| silken | |
| silky | |
| skill(noun, cunning) | |
| sleek | |
| slinking(secret, private, hidden, sneaky, covert) | |
| slyly(noun, adverb, cunning) | |
| snook(verb, slip, hide, steal, evade) | |
| subtile | |
| unconscionable(adjective, corrupt, dishonest, immoral, deceitful) | |
| unctuous | |
| under-the-counter | |
| under-the-table(secret, private, hidden, clandestine, sneaky) | |
| underground(clandestine, undisclosed) | |
| unethical(adjective, corrupt, dishonest, immoral, cunning) |
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| APA | Smart Define. (2016). sly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sly/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "sly thesaurus" https://smartdefine.org/sly/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, sly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sly/thesaurus/synonyms>. |
| MLA | Smart Define. "sly thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/sly/thesaurus/synonyms> |