3
inessential
3
jejune
3
limp(adjective, weak, uncertain, feeble, stiff)
3
negligible(adjective, unimportant, trivial, minor, senseless)
3
petty(adjective, light, weak, slight, easy)
3
phantom
3
piddling(adjective, weak, feeble, tiny)
3
rare(adjective, fine, thin, extraordinary, strange)
3
shattery(adjective, weak, weakness, thin, delicate)
3
small(adjective, light, weak, slight, easy)
3
soft(light, weak, gentle, content, pastel)
3
theoretical(adjective, fantastic, abstract, imaginary, unreal)
3
tottering(adjective, weakness, unstable, ill, shaky)
3
unactual(adjective, unreal)
3
unbodied(adjective, body, immaterial)
3
unconcrete
3
vacuous
3
wispy(adjective, weak, fine, thin, delicate)
3
wobbly(adjective, weak, slight, thin, delicate)
2
absurd(adjective, irrational, unbelievable, implausible, improbable)
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 25 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>