19 entries under impossibility topic. ×

14
unattainable(adjective, inaccessible, impossible)
7
unfeasible(adjective, unreasonable, useless, absurd, impractical)
5
inaccessible(adjective, unreasonable, useless, out, absurd)
5
hopeless(adjective, unreasonable, useless, absurd, pessimistic)
5
insurmountable(adjective, unreasonable, useless, absurd, hopeless)
3
unobtainable(adjective, unreasonable, useless, absurd, hopeless)
3
infeasible(adjective, unreasonable, useless, absurd, preposterous)
3
insuperable
2
impassable(adjective, unreasonable, useless, absurd, hopeless)
2
impervious(adjective, unreasonable, useless, absurd, hopeless)
1
out of reach(expression, idiom)
1
unsurmountable
0
beyond control(expression, idiom)
0
incompatible
0
inextricable
0
innavigable
0
self-contradictory
0
uncomeatable
-1
desperate
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APASmart Define. (2015). unachievable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unachievable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unachievable thesaurus" https://smartdefine.org/unachievable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unachievable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unachievable/thesaurus/synonyms>.
MLASmart Define. "unachievable thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unachievable/thesaurus/synonyms>