75 entries under flimsy topic. ×

1
sparse(adjective, mean, weak, slight, flat)
1
tacky(weak, slight, thin, feeble)
1
tumble-down(feeble, frail, dilapidated, debilitated)
1
vapid(adjective, flat, poor, value, insignificant)
1
wafer-thin(adjective, thin, frail, slim, shallow)
1
wasted(adjective, uncertain, feeble, frail, puny)
1
weather-beaten(feeble, frail, dilapidated, debilitated)
1
worn(feeble, frail, dilapidated, debilitated)
0
cardboard(adjective, thin, frail, slim)
0
crisp(delicate, brittle)
0
disposable(adjective, thin, frail, slim)
0
fracturable(weak, delicate, infirm, fragile)
0
shatterable(weak, delicate, infirm, fragile)
0
shivery(delicate, brittle)
0
superannuated(feeble, frail, dilapidated, debilitated)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>