19 entries under impossibility topic. ×

12
insurmountable(adjective, do, unreasonable, useless, remote)
11
impervious(adjective, solid, unreasonable, useless, absurd)
10
inaccessible(adjective, unreasonable, useless, out, absurd)
7
insuperable(adjective, strong, secure, do, resolute)
3
unsurmountable
2
unattainable(adjective, inaccessible, impossible)
1
desperate
1
inextricable
1
innavigable
1
uncomeatable
0
beyond control(expression, idiom)
0
hopeless
0
impracticable unachievable(expression, idiom)
0
incompatible
0
infeasible
0
out of reach(expression, idiom)
0
self-contradictory
0
unfeasible
0
unobtainable
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APASmart Define. (2015). impassable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impassable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impassable thesaurus" https://smartdefine.org/impassable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, impassable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impassable/thesaurus/synonyms>.
MLASmart Define. "impassable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/impassable/thesaurus/synonyms>