384 entries under adjective topic. ×

29
unsubstantial(dull, body, strong, light)
26
flimsy(strong, light, weak, slight)
25
feeble(dull, strong, light, weak)
20
slight(mean, light, weak, easy)
19
frail(strong, light, weak, slight)
18
thin(dull, mean, light, weak)
17
weak(dull, strong, light, soft)
15
fanciful(weak, strange, fantasy, imaginary)
15
fragile(strong, light, weak, slight)
15
immaterial(body, light, weak, slight)
15
intangible(light, weak, slight, fake)
15
tenuous(strong, light, weak, slight)
15
unreal(weak, fake, abstract, imaginary)
14
insignificant(weak, value, small, unimportant)
14
airy(light, weak, slight, easy)
14
trivial(light, slight, easy, thin)
13
illusory(weak, strange, fantasy, imaginary)
13
lightweight(light, slight, easy, thin)
13
poor(dull, mean, light, weak)
12
incorporeal(body, light, weak, abstract)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>