40 entries under unsubstantial topic. ×

20
intangible(adjective, knowledge, little, abstract, heavenly)
16
imperceptible(adjective, hard, knowledge, fine, faint)
13
unsubstantial(adjective, little, abstract, heavenly, theoretical)
12
immaterial(adjective, form, false, abstract, heavenly)
11
ethereal(adjective, light, delicate, heavenly, imperceptible)
10
imponderable(adjective, knowledge, heavenly, subtle, imperceptible)
10
incorporeal(adjective, abstract, heavenly, insubstantial, theoretical)
9
fine(adjective, light, delicate, little, imperceptible)
9
insubstantial(adjective, fake, false, abstract, fanciful)
9
unperceivable(adjective, intangible)
8
inappreciable(adjective, knowledge, imperceptible, littleness)
7
airy(adjective, heavenly, insubstantial, imperceptible)
7
shadowy(adjective, heavenly, unclear, subtle, imperceptible)
7
unreal(adjective, fake, abstract, theoretical, imperceptible)
7
vague(adjective, clear, definite, unclear, subtle)
6
indiscernible(adjective, knowledge, intangible)
6
insensible(adjective, knowledge, heavenly, subtle, imperceptible)
6
tenuous(adjective, intangible)
6
unobservable(adjective, knowledge, imperceptible, intangible)
5
chimerical(adjective, fake, false, imaginary, fanciful)
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APASmart Define. (2015). impalpable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/impalpable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impalpable thesaurus" https://smartdefine.org/impalpable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, impalpable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impalpable/thesaurus/synonyms>.
MLASmart Define. "impalpable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/impalpable/thesaurus/synonyms>