11 entries under impossible topic. ×

14
unattainable(adjective, expensive, high-priced, pricey, pricely)
7
unreachable(adjective, inaccessible, out-of-the-way, unattainable)
6
impossible
4
unfeasible(adjective, impossibility)
3
impracticable
3
unworkable
2
absurd
2
implausible
2
inconceivable
1
out-of-the-way(unattainable, unapproachable, unreachable, unfeasible)
1
unrealizable
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APASmart Define. (2015). unobtainable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unobtainable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unobtainable thesaurus" https://smartdefine.org/unobtainable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unobtainable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unobtainable/thesaurus/synonyms>.
MLASmart Define. "unobtainable thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unobtainable/thesaurus/synonyms>