147 entries under unknown topic. ×
| inconceivable(adjective, unreasonable, dubious, flimsy) | |
| intangible(adjective, vague, general, subtle) | |
| shrouded(verb, adjective, cover, dark, mysterious) | |
| undercover(secret, hidden, concealed, indirect) | |
| undetermined(adjective, weak, rough, dark, strange) | |
| unidentified(adjective, strange, secret, hidden) | |
| unnamed(adjective, strange, indefinite, unidentified) | |
| unnoted(adjective, strange, isolated, indefinite) | |
| unspecific(adjective, vague, general, unclear) | |
| clandestine(adjective, secret, hidden, underground) | |
| foreign(strange, new, indefinite, unrelated) | |
| indeterminable(adjective, vague, general, unclear) | |
| private(adjective, quiet, remote, secret) | |
| reticent(adjective, clandestine, underground, undisclosed) | |
| sequestered(adjective, quiet, dark, remote) | |
| undisclosed(adjective, cover, dark, hidden) | |
| undiscovered(adjective, strange, unfamiliar, hidden) | |
| unsettled(adjective, rough, uncertain, doubtful, distant) | |
| broad(adjective, vague, general, unclear) | |
| disguised(adjective, secret, hidden, imperceptible) |
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| APA | Smart Define. (2016). obscure thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/obscure/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "obscure thesaurus" https://smartdefine.org/obscure/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, obscure thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/obscure/thesaurus/synonyms>. |
| MLA | Smart Define. "obscure thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/obscure/thesaurus/synonyms> |