| enigmatic | |
| hopeless | |
| indivisible | |
| irresolvable(adjective, unable, answered) | |
| perplexing | |
| puzzling | |
| unexplainable(adjective, inexplicable) | |
| unresolvable | |
| unresolved(adjective, unable, answered) | |
| unsolved(adjective, unable, answered) | |
| abstruse(strange, unknown, curious, concealed, inexplicable) | |
| active | |
| alchemistic(strange, unknown, curious, concealed, inexplicable) | |
| arcane | |
| astrological(strange, unknown, curious, concealed, inexplicable) | |
| awkward(tough, difficult, wild, obstinate, stubborn) | |
| cantankerous(tough, difficult, wild, awkward, obstinate) | |
| complicated | |
| concealed(strange, unknown, curious, inexplicable, unexplained) | |
| contrary(tough, difficult, wild, awkward, obstinate) |
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| APA | Smart Define. (2015). insoluble thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/insoluble/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "insoluble thesaurus" https://smartdefine.org/insoluble/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, insoluble thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/insoluble/thesaurus/synonyms>. |
| MLA | Smart Define. "insoluble thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/insoluble/thesaurus/synonyms> |