Synonyms|860Antonyms|162|Broader|10Narrower|5Related|1.4k

384 entries under adjective topic. ×

2
cobwebby(light, delicate, airy, fragile)
2
dainty(light, weak, slight, easy)
2
delusional(strange, fantasy, unreal)
2
feathery(light, slight, easy, thin)
2
fictional(strange, negative, fantasy, imaginary)
2
finespun(light, airy, fragile, transparent)
2
frangible(weak, delicate, infirm, flimsy)
2
frothy(light, slight, easy, thin)
2
gaseous(ghostly, unearthly, otherworldly, wraithlike)
2
ghostly
2
hallucinational(strange, fantasy, unreal)
2
hallucinative(strange, fantasy, unreal)
2
hollow(slight, value, insignificant, unimportant)
2
incongruous(false, strange, fantasy, insane)
2
incredible(strange, fantasy, imaginary, unreal)
2
indefinite(imperceptible, immaterial, incorporeal)
2
insufficient(weak, slight, flat, poor)
2
little(light, slight, easy, thin)
2
makeshift(poor, uncertain, feeble, hesitant)
2
nugatory(value, insignificant, unimportant, empty)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 27 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>