- Definitions|1
- Thesaurus|295
- Abbreviations|0
| unusual(adjective, strange, unfathomable, puzzling) | |
| unfounded(adjective, defended, verbal attack) | |
| abnormal | |
| alchemic | |
| ambiguous(adjective, hidden, unfathomable, incomprehensible, enigmatic) | |
| astounding | |
| bewildering | |
| beyond comprehension | |
| cabalistic(adjective, difficult, hidden, unfathomable, incomprehensible) | |
| confounding | |
| crazy | |
| curious | |
| deadpan(ambiguous, unfathomable, enigmatic, sphinx-like) | |
| difficult(adjective, ambiguous, hidden, unfathomable, incomprehensible) | |
| exceptional | |
| explanation | |
| extramundane | |
| far-out | |
| ghostly | |
| hidden(adjective, difficult, unfathomable, incomprehensible, enigmatic) |
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| APA | Smart Define. (2015). unexplainable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unexplainable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unexplainable thesaurus" https://smartdefine.org/unexplainable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unexplainable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unexplainable/thesaurus/synonyms>. |
| MLA | Smart Define. "unexplainable thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/unexplainable/thesaurus/synonyms> |