147 entries under unknown topic. ×
| undetected(adjective, dark, secret, hidden) | |
| anomalous(new, untried) | |
| bizarre(new, untried, paranormal, mystic) | |
| classified(clandestine, underground, undisclosed, unrevealed) | |
| cloak-and-dagger(clandestine, underground, undisclosed, unrevealed) | |
| cloak and dagger(expression, idiom, unrevealed) | |
| closet(clandestine, underground, undisclosed, unrevealed) | |
| conspiratorial(clandestine, underground, undisclosed, unrevealed) | |
| different(adjective, strange, new, untried) | |
| exceptional(adjective, unfamiliar) | |
| extraordinary(excellent, superior, new, fantastic) | |
| inexhaustible(adjective, vague, general, unclear) | |
| innumerable(adjective, vague, general, unclear) | |
| on the QT(expression, idiom, clandestine, underground) | |
| open-ended(adjective, vague, unfixed, unlimited) | |
| preposterous(adjective, unfamiliar) | |
| remarkable(new, untried) | |
| shocking(adjective, unfamiliar) | |
| singular(adjective, unfamiliar) | |
| unaccustomed(new, untried) |
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| APA | Smart Define. (2016). obscure thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/obscure/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "obscure thesaurus" https://smartdefine.org/obscure/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, obscure thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/obscure/thesaurus/synonyms>. |
| MLA | Smart Define. "obscure thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/obscure/thesaurus/synonyms> |