Synonyms|453Antonyms|53|Broader|4Narrower|9Related|258
1
freakish(extraordinary, unusual, strange, marvelous, special)
1
full of holes(expression, idiom, extraordinary, amazing, incredible)
1
hard of belief(expression, idiom)
1
hard to believe(expression, idiom)
1
harebrained(extraordinary, amazing, incredible)
1
heavy
1
hundred-to-one(unreasonable, useless, doubtful, absurd, hopeless)
1
imcomprehensible(adjective, extraordinary, strange, unbelievable, implausible)
1
immeasurable
1
impracticable(adjective, unreasonable, useless, doubtful, absurd)
1
incogitable(adjective, extraordinary, strange, amazing, implausible)
1
incredulous
1
indecipherable
1
inexpressible(adjective, unspeakable)
1
inscrutableness
1
insufferable
1
insupposable(adjective, extraordinary, strange, unbelievable, implausible)
1
kooky(extraordinary, amazing, incredible)
1
lamebrained(extraordinary, amazing, incredible)
1
logically impossible
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ChicagoSmart Define. 2015. "unimaginable thesaurus" https://smartdefine.org/unimaginable/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unimaginable thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unimaginable/thesaurus/synonyms>.
MLASmart Define. "unimaginable thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unimaginable/thesaurus/synonyms>