Synonyms|453Antonyms|53|Broader|4Narrower|9Related|258
2
not possible(expression, idiom, impossibility)
2
open to doubt(expression, idiom, extraordinary, amazing, incredible)
2
outlandish(extraordinary, exceptional, amazing, remarkable, particular)
2
passing strange(expression, idiom, wonder)
2
questionable(extraordinary, amazing, doubtful, dubious, unlikely)
2
remote(adjective, doubtful, dubious, improbable, impossible)
2
suspect(extraordinary, amazing, unbelievable, implausible, incredible)
2
thick(extraordinary, amazing, incredible)
2
thin(adjective, light, extraordinary, strange, amazing)
2
uncanvassed(unsolicited, uninvited, unsought)
2
undreamed of
2
unfathomable(adjective, size)
2
unimagined
2
unspeakable(adjective, bad)
2
unworkable(adjective, impossible)
1
Greek(unfathomable, impenetrable, opaque, unintelligible, puzzling)
1
anomalous(excellent, extraordinary, strange, exceptional, marvelous)
1
antic
1
arcane(adjective, unusual, special, rare)
1
barred
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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>