| inscrutable | |
| intangible(adjective, unknown, unfixed, unlimited) | |
| little known(expression, strange, indefinite, unidentified) | |
| misty | |
| misunderstood(unclear, indistinct, indistinguishable) | |
| muddy(unclear, indistinct, indistinguishable) | |
| not named | |
| occasional | |
| one | |
| open-ended(adjective, unknown, unfixed, unlimited) | |
| particular | |
| peculiar | |
| perplexing(unclear, indistinct, indistinguishable) | |
| personal | |
| private | |
| problematic(unclear, indistinct, indistinguishable) | |
| puzzling(unclear, indistinct, indistinguishable) | |
| remote(strange, indefinite, unidentified) | |
| serendipitous | |
| so-and-so(strange, indefinite, unidentified) |
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| APA | Smart Define. (2015). unspecified thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unspecified/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unspecified thesaurus" https://smartdefine.org/unspecified/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unspecified thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unspecified/thesaurus/synonyms>. |
| MLA | Smart Define. "unspecified thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unspecified/thesaurus/synonyms> |