350 entries under adjective topic. ×

4
unrealistic
4
worthless(weak, feeble, useless, trivial)
4
wraithlike(heavenly, ghostly, incorporeal, nonmaterial)
3
abstract(fantastic, unreal, insubstantial, theoretical)
3
brittle(weak, delicate, feeble, infirm)
3
delusionary
3
evanescent
3
fancied(strange, fantasy, unreal)
3
fantastical(strange, fantasy, unreal)
3
fine
3
inconsiderable(weak, soft, gentle, mild)
3
inessential
3
limp(weak, uncertain, feeble, stiff)
3
negligible(unimportant, trivial, minor, senseless)
3
petty(light, weak, slight, easy)
3
phantom
3
piddling(weak, feeble, tiny)
3
rare(fine, thin, extraordinary, strange)
3
shattery(weak, weakness, thin, delicate)
3
small(light, weak, slight, easy)
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APASmart Define. (2016). unsubstantial thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unsubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsubstantial thesaurus" https://smartdefine.org/unsubstantial/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unsubstantial thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unsubstantial/thesaurus/synonyms>.
MLASmart Define. "unsubstantial thesaurus" 30 March 2016. Web. 27 September 2026. <https://smartdefine.org/unsubstantial/thesaurus/synonyms>