130 entries under feeble topic. ×

1
ailing(adjective, weak, delicate, false, unstable)
1
anemic(adjective, dull, light, weak, soft)
1
anile(adjective, weak, delicate, ill, sick)
1
chiffon(weak, slight, thin, tacky)
1
cut-rate(weak, slight, thin, tacky)
1
defective(bad, weak, thin, false)
1
diminutive(weak, frail, tiny, measly)
1
exhausted(adjective, uncertain, useless, trivial)
1
failing(adjective, weak, delicate, ill, sick)
1
fishy(adjective, weak, great, delicate, extraordinary)
1
flaccid(adjective, uncertain, shaky, hesitant)
1
forceless(adjective, uncertain, shaky, hesitant)
1
half-pint(weak, frail, tiny, measly)
1
halting(adjective, weak, delicate, ill, sick)
1
house of cards(expression, weak, slight, thin)
1
ill(adjective, weak, delicate, false, unstable)
1
impuissant(adjective, uncertain, shaky, hesitant)
1
inferior(weak, tiny)
1
irresolute(adjective, weak, delicate, uncertain, ill)
1
laid low(expression, adjective, weak, delicate, ill)
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>