75 entries under flimsy topic. ×

2
sheer(adjective, light, weak, slight, easy)
1
aged(adjective, weak, thin, delicate, feeble)
1
anile(weak, delicate, feeble, infirm)
1
antiquated(feeble, frail, dilapidated, debilitated)
1
battered(feeble, frail, dilapidated, debilitated)
1
bedraggled(feeble, frail, dilapidated, debilitated)
1
crumbly(adjective, light, slight, easy, thin)
1
debilitated(adjective, weak, thin, delicate, uncertain)
1
doddering(adjective, weak, thin, delicate, feeble)
1
effete(adjective, weak, thin, delicate, uncertain)
1
friable(adjective, light, slight, easy, thin)
1
haggard(adjective, dull, light, soft, poor)
1
incapacitated(feeble, frail, dilapidated, debilitated)
1
paper(adjective, thin)
1
paper-thin(adjective, thin, frail, slim, shallow)
1
quavering(feeble, frail, dilapidated, debilitated)
1
seedy(feeble, frail, dilapidated, debilitated)
1
senile(adjective, uncertain, feeble, frail, puny)
1
shaking(feeble, frail, dilapidated, debilitated)
1
skimpy(adjective, mean, weak, slight, flat)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 29 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>