Synonyms|796Antonyms|149|Broader|10Narrower|0Related|951

54 entries under extraordinary topic. ×

1
fishy(adjective, weak, great, delicate)
1
for the birds(expression, idiom, unreasonable, dubious)
1
full of holes(expression, idiom, unreasonable, dubious)
1
harebrained(amazing, incredible)
1
impossible(strange, unreasonable, amazing, dubious)
1
incogitable(strange, amazing, unbelievable, implausible)
1
insupposable(strange, unbelievable, implausible, improbable)
1
lamebrained(amazing, incredible)
1
mind-boggling(strange, amazing, unbelievable, implausible)
1
open to doubt(expression, idiom, amazing, incredible)
1
outlandish(amazing, unbelievable, implausible, incredible)
1
past belief(expression, amazing, incredible)
1
phony(strange, amazing, unbelievable, implausible)
1
questionable(amazing, doubtful, unlikely, implausible)
1
reachy(strange, unreasonable, dubious, unlikely)
1
scatterbrained(amazing, incredible)
1
screwy(amazing, irrational, incredible, unreasoned)
1
staggering(strange, amazing, unbelievable, implausible)
1
suspect(unreasonable, amazing, dubious, unlikely)
1
too much(expression, thin, unreasonable, dubious)
For more, visit Unsubstantial on Power Thesaurus
10 years ago|15k views|share |citing 
APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>