| shadowy(adjective, weak, obscure, dark, dim) | |
| formless(adjective, vague, disorganized, shapeless) | |
| fuzzy(adjective, vague) | |
| indefinable | |
| endless(adjective, immense, infinite, boundless, unlimited) | |
| faint | |
| foggy | |
| general(adjective, uncertain, vague, unknown, unclear) | |
| ill-defined(adjective, weak, obscure, dark, dim) | |
| imprecise(adjective, uncertain, vague, unknown, general) | |
| infinite(adjective, vague, unknown, general, unclear) | |
| pale(adjective, drab) | |
| blurry | |
| broad(adjective, vague, unknown, general, unclear) | |
| confused(adjective, weak, obscure, dark, uncertainty) | |
| perpetual(adjective, infinite) | |
| shapeless(adjective, shapeless) | |
| unbounded(adjective, immense, infinite, boundless, unlimited) | |
| undefinable(adjective, uncertainty) | |
| unknown(adjective, vague, general, unclear, ambiguous) |
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| APA | Smart Define. (2015). undefined thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/undefined/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "undefined thesaurus" https://smartdefine.org/undefined/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, undefined thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/undefined/thesaurus/synonyms>. |
| MLA | Smart Define. "undefined thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/undefined/thesaurus/synonyms> |