Synonyms|607Antonyms|112|Broader|9Narrower|11Related|650
2
nonsensical(adjective, silly, ridiculous, absurd, impractical)
2
not a prayer(noun, expression, adjective, idiom, wild)
2
overwhelming(adjective, hopeless, unutterable, inexpressible, insuperable)
2
oxymoronic
2
pair
2
positive
2
radical
2
rational
2
silly(adjective, ridiculous, absurd, outrageous, unlikely)
2
staggering(adjective, extraordinary, strange, amazing, unbelievable)
2
surd
2
suspect(extraordinary, unreasonable, amazing, dubious, unlikely)
2
tall(adjective, hard, difficult, false, unreasonable)
2
too much(expression, adjective, false, unreasonable, embellished)
2
transcendental(adjective, perfect, ideal, heavenly, imaginary)
2
uncertain(difficulty, unbelief doubt)
2
uncorrectable
2
unrecoverable(adjective, hopeless)
2
untenable(unbelievable, implausible, improbable)
2
unusable(adjective, wild, unreasonable, useless, absurd)
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ChicagoSmart Define. 2016. "impossible thesaurus" https://smartdefine.org/impossible/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, impossible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impossible/thesaurus/synonyms>.
MLASmart Define. "impossible thesaurus" 9 March 2016. Web. 22 September 2026. <https://smartdefine.org/impossible/thesaurus/synonyms>