20 entries under unsubstantial topic. ×

13
spectral(adjective, heavenly, airy, shadowy, insensible)
11
phantasmal(adjective, unreal, shadowy, theoretical, ghastly)
6
immaterial(adjective, form, heavenly, airy, insensible)
4
illusory(adjective, unreal, shadowy, theoretical, ghastly)
4
unreal
4
unsubstantial(adjective, fantastic, heavenly, unreal, theoretical)
3
chimerical
3
ethereal(adjective, supernatural, heavenly, ghostly)
2
impalpable(adjective, heavenly, incorporeal, nonmaterial)
2
intangible(adjective, heavenly, incorporeal, nonmaterial)
2
vacant
1
empty
1
inessential
1
insignificance
1
nonexistence
1
null
1
tenuous
1
unconcrete
1
vacuous
1
weightless
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APASmart Define. (2015). apparitional thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/apparitional/thesaurus/synonyms
ChicagoSmart Define. 2015. "apparitional thesaurus" https://smartdefine.org/apparitional/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, apparitional thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/apparitional/thesaurus/synonyms>.
MLASmart Define. "apparitional thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/apparitional/thesaurus/synonyms>