- Definitions|1
- Thesaurus|473
- Abbreviations|0
| distorted(unclear, blurry) | |
| doubtful(adjective, weak, obscure, rough, dark) | |
| dreary(adjective, dull, dark, gloomy, faint) | |
| dubious(adjective, rough, vague, unknown, unclear) | |
| dusk(adjective, dull, dark, gloomy, faint) | |
| flat(adjective, dull, dark, gloomy, faint) | |
| flickering | |
| gray(adjective, dull, dark, gloomy, faint) | |
| hushed(adjective, weak, pale, faded) | |
| imperfect | |
| inchoate | |
| incomprehensible | |
| indecipherable | |
| indecisive | |
| indefinable | |
| insensible | |
| invisible | |
| lackluster(adjective, dull, dark, gloomy, faint) | |
| lightless(adjective, dull, dark, gloomy, faint) | |
| low(adjective, weak, pale, unclear, hazy) |
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| APA | Smart Define. (2015). ill-defined thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/ill-defined/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "ill-defined thesaurus" https://smartdefine.org/ill-defined/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, ill-defined thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/ill-defined/thesaurus/synonyms>. |
| MLA | Smart Define. "ill-defined thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/ill-defined/thesaurus/synonyms> |