130 entries under feeble topic. ×

6
trifling(adjective, light, weak, soft, slight)
5
breakable(adjective, weak, delicate, infirm)
5
frangible(adjective, weak, delicate, infirm)
5
sleazy(adjective, weak, slight, thin)
5
weakly(adjective, strong, weak, delicate, uncertain)
4
dainty(adjective, light, weak, slight, easy)
4
faint(adjective, dull, light, weak, soft)
4
inconsequential(adjective, light, weak, soft, slight)
4
worthless(adjective, weak, useless, trivial)
3
brittle(adjective, weak, delicate, infirm)
3
limp(adjective, weak, uncertain, stiff)
3
petty(adjective, light, weak, slight, easy)
3
piddling(adjective, weak, tiny)
3
shattery(adjective, weak, weakness, thin, delicate)
3
small(adjective, light, weak, slight, easy)
3
wispy(adjective, weak, fine, thin, delicate)
3
wobbly(adjective, weak, slight, thin, delicate)
2
debilitated(adjective, weak, delicate, uncertain, ill)
2
effete(adjective, uncertain, shaky, hesitant)
2
enervated(adjective, uncertain, shaky, hesitant)
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 27 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>