| extraneous | |
| faint(unclear, indistinct, indistinguishable) | |
| far(strange, indefinite, unidentified) | |
| far-off(strange, indefinite, unidentified) | |
| faraway(strange, indefinite, unidentified) | |
| filmy | |
| formless(unclear, indistinct, indistinguishable) | |
| fortuitous | |
| given | |
| hardly discernible | |
| hardly distinguishable | |
| impalpable(unclear, indistinct, indistinguishable) | |
| in doubt | |
| incog(strange, indefinite, unidentified) | |
| inconclusive | |
| indistinguishable(unclear, indistinct) | |
| inexhaustible(adjective, unknown, unfixed, unlimited) | |
| inexplicable(unclear, indistinct, indistinguishable) | |
| infinite(adjective, unknown, unfixed, unlimited) | |
| innumerable(adjective, unknown, unfixed, unlimited) |
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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> |