26 entries under doubtful topic. ×

13
implausible(adjective, extraordinary, strange, amazing)
6
fanciful(great, excellent, superb, super)
6
unheard-of(adjective, extraordinary, strange, exceptional, special)
5
absurd(adjective, unreasonable, useless, dubious)
4
dubious(adjective, extraordinary, amazing, unlikely)
4
unconvincing(adjective, extraordinary, strange, amazing)
2
far-fetched(adjective, extraordinary, amazing, unlikely)
2
questionable(extraordinary, amazing, dubious, unlikely)
2
remote(adjective, dubious, improbable, impossible)
1
flimsy(light, thin, strange, rare)
1
hundred-to-one(unreasonable, useless, absurd, hopeless)
1
impracticable(adjective, unreasonable, useless, absurd)
1
not likely(expression, dubious, unlikely, implausible)
1
outside chance(expression, dubious, unlikely, implausible)
1
unsubstantial(adjective, extraordinary, strange, amazing)
1
weak(adjective, extraordinary, strange, amazing)
0
contrary(dubious, improbable)
0
faint(dubious, improbable)
0
iffy(unlikely, implausible)
0
not expected(expression, unlikely, implausible)
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APASmart Define. (2015). unimaginable thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unimaginable/thesaurus/synonyms
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>