| inexplicable(adjective, strange, explanation, unable, unfathomable) | |
| indissoluble(adjective, density) | |
| unsolvable(adjective, unable, unfathomable, answered, solved) | |
| inextricable(adjective, unable, inscrutable, answered, irresolvable) | |
| difficult(adjective, tough, wild, strange, awkward) | |
| incomprehensible(adjective, strange, unfathomable, inexplicable, unexplained) | |
| mysterious(adjective, secret, concealed) | |
| impossible | |
| insolvable | |
| mystifying(adjective, unable, answered) | |
| baffling(adjective, unable, answered) | |
| obscure(adjective, unable, understood, answered) | |
| impenetrable(adjective, strange, unable, inexplicable, unexplained) | |
| indissolvable | |
| inscrutable(adjective, strange, inexplicable, unexplained, unintelligibility) | |
| insuperable | |
| intractable(adjective, difficult, obstinate, stubborn, willful) | |
| unfathomable(adjective, strange, unable, inexplicable, unexplained) | |
| infusible(adjective, density) | |
| unaccountable(adjective, unable, unintelligibility, answered) |
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| APA | Smart Define. (2015). insoluble thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/insoluble/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "insoluble thesaurus" https://smartdefine.org/insoluble/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, insoluble thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/insoluble/thesaurus/synonyms>. |
| MLA | Smart Define. "insoluble thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/insoluble/thesaurus/synonyms> |