19 entries under impossibility topic. ×

12
unfeasible(adjective, wild, unreasonable, useless, absurd)
6
unattainable(adjective, wild, unreasonable, useless, absurd)
3
hopeless
2
inaccessible
1
desperate
1
impassable
1
impervious
1
incompatible
1
inextricable
1
unobtainable
0
beyond control(expression, idiom)
0
impracticable unachievable(expression, idiom)
0
innavigable
0
insuperable
0
insurmountable
0
out of reach(expression, idiom)
0
self-contradictory
0
uncomeatable
0
unsurmountable
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APASmart Define. (2015). infeasible thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/infeasible/thesaurus/synonyms
ChicagoSmart Define. 2015. "infeasible thesaurus" https://smartdefine.org/infeasible/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, infeasible thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/infeasible/thesaurus/synonyms>.
MLASmart Define. "infeasible thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/infeasible/thesaurus/synonyms>