96 entries under feeble topic. ×

29
unsubstantial(adjective, dull, body, strong, light)
26
flimsy(adjective, strong, light, weak, slight)
19
frail(adjective, strong, light, weak, slight)
17
weak(adjective, dull, strong, light, soft)
15
fragile(adjective, strong, light, weak, slight)
11
decrepit(adjective, strong, light, weak, slight)
11
delicate(adjective, strong, light, weak, slight)
10
gossamer(adjective, light, thin, flimsy)
10
unsound(adjective, strong, light, weak, slight)
9
puny(adjective, strong, light, weak, slight)
8
infirm(adjective, strong, light, weak, slight)
8
rickety(adjective, weak, slight, weakness, thin)
7
shaky(adjective, weak, slight, thin, delicate)
7
superficial(adjective, weak, slight, flat, poor)
6
gauzy(adjective, light, weak, thin)
6
inadequate(adjective, dull, light, weak, soft)
6
ramshackle(adjective, frail, unsound, flimsy)
5
diaphanous(adjective, light, weak, thin)
5
weakly(adjective, strong, weak, thin, delicate)
4
sleazy(adjective, weak, slight, thin)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 25 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>