350 entries under adjective topic. ×

11
unsound(bad, strong, light, weak)
10
decrepit(strong, light, weak, slight)
10
delicate(strong, light, weak, slight)
10
illusory(light, weak, slight, strange)
10
incorporeal(body, light, abstract, heavenly)
10
infirm(strong, light, weak, slight)
10
rickety(weak, slight, weakness, thin)
10
shadowy(gentle, obscure, substance, marvelous)
9
airy(light, weak, slight, easy)
9
bodiless(body, abstract, heavenly, theoretical)
9
impalpable(abstract, heavenly, theoretical, immaterial)
9
insignificant(weak, soft, gentle, mild)
9
tenuous(strong, light, weak, slight)
8
diaphanous(weak, slight, thin, substance)
8
puny(strong, light, weak, soft)
7
chimerical(light, weak, slight, gentle)
7
delusive(strange, trivial, fantasy, insufficient)
7
disembodied(body, heavenly, incorporeal, nonmaterial)
7
fanciful(light, gentle, strange, fantasy)
7
implausible(thin, extraordinary, strange, unreasonable)
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>