39 entries under obscure topic. ×
| covered(adjective, unknown, hidden, concealed) | |
| cloak-and-dagger(adjective, unknown, hidden, clandestine) | |
| furtive(adjective, secret, unknown, hidden) | |
| private(adjective, secret, unknown, hidden) | |
| deep(adjective, down, unknown, far) | |
| secluded(adjective, secret, unknown, hidden) | |
| clouded(secret, unknown, hidden, concealed) | |
| mysterious(adjective, secret, unknown, hidden) | |
| occult(noun, secret, unknown, hidden) | |
| abstruse(secret, unknown, hidden, concealed) | |
| close(secret, unknown, hidden, concealed) | |
| closet(unknown, hidden, clandestine, fraudulent) | |
| mystic(adjective, secret, unknown, hidden) | |
| mystical(adjective, secret, unknown, hidden) | |
| recondite(secret, unknown, hidden, concealed) | |
| undisclosed(adjective, secret, unknown, hidden) | |
| unknown(secret, hidden, concealed, unseen) | |
| classified(unknown, clandestine, undisclosed, unrevealed) | |
| cryptic(secret, unknown, hidden, concealed) | |
| esoteric(secret, unknown, hidden, concealed) |
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| APA | Smart Define. (2015). underground thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/underground/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "underground thesaurus" https://smartdefine.org/underground/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, underground thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/underground/thesaurus/synonyms>. |
| MLA | Smart Define. "underground thesaurus" 3 November 2015. Web. 25 September 2026. <https://smartdefine.org/underground/thesaurus/synonyms> |