51 entries under uncertain topic. ×

30
insubstantial(adjective, dull, body, strong, light)
27
flimsy(adjective, strong, light, weak, great)
23
weak(adjective, dull, strong, light, great)
19
fragile(adjective, strong, light, weak, slight)
19
frail(adjective, strong, light, weak, slight)
18
feeble(adjective, dull, strong, light, weak)
11
shaky(adjective, weak, slight, thin, delicate)
11
unsound(adjective, bad, strong, light, weak)
10
decrepit(adjective, strong, light, weak, slight)
10
delicate(adjective, strong, light, weak, slight)
10
infirm(adjective, strong, light, weak, slight)
10
rickety(adjective, weak, slight, weakness, thin)
8
puny(adjective, strong, light, weak, soft)
7
unsteady(adjective, false, unstable, ill)
5
weakly(adjective, strong, weak, delicate)
4
faint(adjective, dull, light, weak, soft)
3
limp(adjective, weak, feeble, stiff)
3
wobbly(adjective, weak, slight, thin, delicate)
2
debilitated(adjective, weak, delicate, ill)
2
effete(adjective, feeble, shaky, hesitant)
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>