5
discarnate(adjective, body, abstract, heavenly, theoretical)
5
fallacious(bad, false, ill, error, insane)
5
false(bad, light, weak, slight, ill)
5
frangible(adjective, weak, delicate, feeble, infirm)
5
hallucinatory(adjective, strange, negative, fantastic, fantasy)
5
illusional(adjective, strange, fantasy, unreal)
5
illusionary(adjective, strange, fantasy, unreal)
5
illusive(adjective, strange, fantasy, unreal)
5
imponderable(adjective, light, weak, slight, heavenly)
5
improbable(adjective, thin, extraordinary, strange, unreasonable)
5
inadequate(adjective, dull, light, weak, soft)
5
inconceivable(adjective, thin, extraordinary, belief, unreasonable)
5
pale(adjective, dull, light, soft, poor)
5
phantasmagoric(adjective, excellent, gentle, marvelous, vague)
5
ramshackle
5
sleazy(adjective, weak, slight, thin, feeble)
5
supernatural(adjective, abstract, heavenly, theoretical, immaterial)
5
unearthly(adjective, abstract, heavenly, theoretical, immaterial)
5
unimportant(adjective, weak, soft, gentle, mild)
5
unworldly(adjective, heavenly, immaterial, ghostly, incorporeal)
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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>