75 entries under flimsy topic. ×

29
unsubstantial(adjective, dull, body, strong, light)
25
feeble(adjective, dull, strong, light, weak)
20
slight(adjective, mean, light, weak, easy)
19
frail(adjective, strong, light, weak, slight)
18
thin(adjective, dull, mean, light, weak)
17
weak(adjective, dull, strong, light, soft)
15
fanciful(adjective, weak, strange, fantasy, imaginary)
15
fragile(adjective, strong, light, weak, slight)
15
intangible(adjective, light, weak, slight, fake)
15
tenuous(adjective, strong, light, weak, slight)
13
poor(adjective, dull, mean, light, weak)
12
incorporeal(adjective, body, light, weak, abstract)
12
ethereal(adjective, light, slight, easy, thin)
11
decrepit(adjective, strong, light, weak, slight)
11
delicate(adjective, strong, light, weak, slight)
10
ephemeral(adjective, light, weak, slight, short)
10
gossamer(adjective, light, thin, feeble)
10
unsound(adjective, strong, light, weak, slight)
8
infirm(adjective, strong, light, weak, slight)
8
rickety(adjective, weak, slight, weakness, thin)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 27 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>