19 entries under impossibility topic. ×

16
inaccessible(adjective, reach, out, expensive, high-priced)
15
unobtainable(adjective, expensive, high-priced, pricey, pricely)
11
unfeasible(adjective, unreasonable, useless, absurd, impractical)
6
hopeless(adjective, impossible)
6
impervious(adjective, inaccessible, impossible)
6
infeasible(adjective, wild, unreasonable, useless, absurd)
5
insurmountable(adjective, inaccessible, impossible)
5
out of reach(expression, idiom)
4
insuperable
3
unsurmountable
2
impassable(adjective, inaccessible, impossible)
2
incompatible
1
desperate
1
inextricable
0
beyond control(expression, idiom)
0
impracticable unachievable(expression, idiom)
0
innavigable
0
self-contradictory
0
uncomeatable
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APASmart Define. (2015). unattainable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unattainable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unattainable thesaurus" https://smartdefine.org/unattainable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, unattainable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unattainable/thesaurus/synonyms>.
MLASmart Define. "unattainable thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/unattainable/thesaurus/synonyms>