| on the sly(expression, idiom, secret, private, hidden) | |
| out of line(adjective, permitted, sanctioned) | |
| over the line(adjective, permitted, sanctioned) | |
| pale | |
| permitted | |
| personal | |
| pirated(adjective, permitted, sanctioned) | |
| presuppose | |
| racket | |
| reinless | |
| repudiated | |
| secretive(secret, private, hidden) | |
| seedy | |
| simulate | |
| skulking(secret, private, hidden, sneaky, covert) | |
| slinking(secret, private, hidden, sneaky, covert) | |
| sly(secret, private, hidden, sneaky, covert) | |
| smell | |
| sneaking(secret, private, hidden, sneaky, covert) | |
| sneaky(secret, private, hidden, covert) |
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| APA | Smart Define. (2015). unauthorized thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unauthorized/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unauthorized thesaurus" https://smartdefine.org/unauthorized/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unauthorized thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unauthorized/thesaurus/synonyms>. |
| MLA | Smart Define. "unauthorized thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unauthorized/thesaurus/synonyms> |