75 entries under flimsy topic. ×

7
superficial(adjective, weak, slight, flat, poor)
6
filmy(adjective, light, slight, easy, thin)
6
inadequate(adjective, dull, light, weak, soft)
6
ramshackle(adjective, feeble, frail, unsound)
5
weakly(adjective, strong, weak, thin, delicate)
4
fine(adjective, light, slight, delicate)
4
unconvincing(adjective, weak, flat, poor, thin)
3
brittle(adjective, weak, delicate, infirm)
3
creaky(weakness, feeble, frail, debilitated)
3
dilapidated(adjective, feeble, frail, debilitated)
3
jerry-built
3
lame(adjective, weak, flat, poor, thin)
3
scant(adjective, mean, slight, flat, poor)
3
wispy(adjective, light, weak, thin, delicate)
2
breakable(adjective, weak, delicate, infirm)
2
dainty(adjective, light, weak, slight, easy)
2
frangible(adjective, weak, delicate, infirm)
2
insufficient(adjective, weak, slight, flat, poor)
2
run-down(adjective, feeble, frail, dilapidated)
2
scanty(adjective, mean, weak, slight, flat)
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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>