19 entries under impossibility topic. ×

15
impassable(adjective, do, unreasonable, useless, absurd)
14
insuperable(adjective, strong, do, resolute, impossible)
10
unsurmountable
5
unattainable(adjective, inaccessible, impossible)
4
hopeless(adjective, impossible)
4
inaccessible(adjective, out, impossible)
2
unfeasible
1
desperate
1
impervious
1
incompatible
1
inextricable
1
infeasible
1
innavigable
0
beyond control(expression, idiom)
0
impracticable unachievable(expression, idiom)
0
out of reach(expression, idiom)
0
self-contradictory
0
uncomeatable
-1
unobtainable
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APASmart Define. (2015). insurmountable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/insurmountable/thesaurus/synonyms
ChicagoSmart Define. 2015. "insurmountable thesaurus" https://smartdefine.org/insurmountable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, insurmountable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/insurmountable/thesaurus/synonyms>.
MLASmart Define. "insurmountable thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/insurmountable/thesaurus/synonyms>