50 entries under fantastic topic. ×

13
incredible(adjective, extraordinary, strange, superb)
10
unbelievable(adjective, obscure, extraordinary, strange, superb)
10
far-fetched(adjective, hard, strange, uncertain)
6
absurd(adjective, strange, crazy, unreasonable)
6
unconvincing(adjective, extraordinary, strange, doubtful)
6
preposterous(adjective, obscure, strange, exceptional, crazy)
4
unrealistic(adjective, strange, doubtful, dubious)
2
fabulous(adjective, awful, strange, superb, wonderful)
2
fanciful(adjective, strange, doubtful, rare)
2
fictitious(adjective, imaginary, unbelievable, whimsical)
2
unreal(adjective, imaginary, unbelievable, idealistic)
1
bizarre(adjective, strange, doubtful, dubious)
1
imaginary(adjective, strange, weird, eccentric)
1
mind-boggling(extraordinary, strange, unbelievable, implausible)
1
offbeat(adjective, imaginary, unbelievable, whimsical)
1
queer(adjective, strange, crazy, irregular)
1
visionary(adjective, imaginary, unbelievable, whimsical)
0
aerial(adjective, imaginary, unbelievable, whimsical)
0
blue sky(expression, adjective, imaginary, unbelievable)
0
capricious(adjective, strange, crazy, insane)
<123>
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APASmart Define. (2015). unlikely thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unlikely/thesaurus/synonyms
ChicagoSmart Define. 2015. "unlikely thesaurus" https://smartdefine.org/unlikely/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, unlikely thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unlikely/thesaurus/synonyms>.
MLASmart Define. "unlikely thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/unlikely/thesaurus/synonyms>