53 entries under extraordinary topic. ×

4
beyond belief(expression, adjective, idiom, amazing)
3
outlandish(adjective, hard, difficult, amazing)
3
thick(adjective, great, flat, poor, thin)
2
open to doubt(expression, idiom, amazing, incredible)
2
strange(adjective, fantastic, doubtful, dubious)
2
too much(expression, adjective, thin, informal)
1
astonishing(amazing, incredible)
1
cockamamie(amazing, incredible)
1
cockeyed(amazing, irrational, incredible, unreasoned)
1
for the birds(expression, adjective, idiom, amazing)
1
full of holes(expression, adjective, idiom, amazing)
1
harebrained(amazing, incredible)
1
incogitable(strange, amazing, unbelievable, incredible)
1
insupposable(strange, unbelievable, improbable, unthinkable)
1
lamebrained(amazing, incredible)
1
mind-boggling(adjective, strange, fantastic, amazing)
1
past belief(expression, amazing, incredible)
1
phony(strange, amazing, unbelievable, incredible)
1
rare(strange, doubtful, dubious, unlikely)
1
reachy(adjective, strange, likely, unlikely)
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APASmart Define. (2015). implausible thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/implausible/thesaurus/synonyms
ChicagoSmart Define. 2015. "implausible thesaurus" https://smartdefine.org/implausible/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, implausible thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/implausible/thesaurus/synonyms>.
MLASmart Define. "implausible thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/implausible/thesaurus/synonyms>