| stealthy(secret, private, hidden, sneaky, covert) | |
| sub-rosa(secret, private, hidden, sneaky, covert) | |
| suppose | |
| think | |
| unannounced | |
| unbridled | |
| uncalled for(expression, adjective, false, justification, inaccurate) | |
| unchartered | |
| unconfirmed | |
| unconstitutionality | |
| unconsundue | |
| uncorroborated | |
| undemocratic | |
| under the counter | |
| under wraps(expression, secret, private, hidden, sneaky) | |
| undercover(secret, private, hidden, sneaky, covert) | |
| underhand(secret, private, hidden, sneaky, covert) | |
| unendorsed | |
| unentitled | |
| unfounded |
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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> |