- Definitions|1
- Thesaurus|155
- Abbreviations|0
| slily | |
| slinking(adjective, secret, private, hidden, sneaky) | |
| sly(adjective, secret, private, hidden, sneaky) | |
| sneakingly | |
| sneaky(adjective, secret, private, hidden, covert) | |
| steal | |
| stealthy(adjective, secret, private, hidden, sneaky) | |
| sub | |
| sub sigillo | |
| subterranean | |
| subterrestrial(adjective, underground) | |
| subversive | |
| swipe | |
| unauthorized(adjective, secret, private, hidden, sneaky) | |
| underhand(adjective, secret, private, hidden, sneaky) | |
| unfairly | |
| unnoticed | |
| unrecognizably | |
| veiled(adjective, secret, private, hidden, sneaky) | |
| whisper |
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| APA | Smart Define. (2015). on the sly thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/on_the_sly/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "on the sly thesaurus" https://smartdefine.org/on_the_sly/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, on the sly thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/on_the_sly/thesaurus/synonyms>. |
| MLA | Smart Define. "on the sly thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/on_the_sly/thesaurus/synonyms> |