| ungovernable(tough, difficult, wild, awkward, obstinate) | |
| unknowable(adjective, strange, unknown, curious, concealed) | |
| unknown(strange, curious, concealed, inexplicable, unexplained) | |
| unmanageable(tough, difficult, wild, awkward, obstinate) | |
| unnatural(strange, unknown, curious, concealed, inexplicable) | |
| unpliable(tough, difficult, wild, awkward, obstinate) | |
| unruly(tough, difficult, wild, awkward, obstinate) | |
| unsoluble | |
| veiled(strange, unknown, curious, concealed, inexplicable) | |
| wayward(tough, difficult, wild, awkward, obstinate) | |
| weird(adjective, strange, unknown, curious, concealed) | |
| willful(tough, difficult, awkward, obstinate, stubborn) | |
| aerobic | |
| alkaline | |
| alkaloid | |
| anaerobic | |
| bewildering | |
| beyond comprehension | |
| bizarre | |
| bull-headed(obstinate, stubborn, willful) |
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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> |