- Definitions|1
- Thesaurus|697
- Abbreviations|0
| gone | |
| hardly possible(adjective, impossible) | |
| high-flown(adjective, intellectual, unreal) | |
| hundred-to-one(adjective, impossible) | |
| hypothetical(adjective, intellectual, unreal) | |
| imaginary(adjective, intellectual, unreal) | |
| impracticable unachievable(expression, idiom, impossibility) | |
| in the clouds(expression, adjective, idiom, intellectual, unreal) | |
| inapprehensible | |
| inexecutable(adjective, impossible) | |
| innavigable | |
| insoluble | |
| intellectual(adjective, unreal) | |
| irrealizable(adjective, impossible) | |
| irrecoverable | |
| irreparable(adjective, impossible) | |
| irresoluble | |
| irresolvable | |
| lean | |
| lost |
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| APA | Smart Define. (2015). unattainable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unattainable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unattainable thesaurus" https://smartdefine.org/unattainable/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, unattainable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unattainable/thesaurus/synonyms>. |
| MLA | Smart Define. "unattainable thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unattainable/thesaurus/synonyms> |