2
run-down(adjective, feeble, frail, flimsy, dilapidated)
2
scanty(adjective, mean, weak, slight, flat)
2
senseless(adjective, value, insignificant, unimportant, empty)
2
shabby(adjective, slight, small, miserable, inadequate)
2
sheer(adjective, light, weak, slight, easy)
2
short-lived
2
sketchy(slight, poor, trivial, insufficient, scarce)
2
skin-deep
2
slim(adjective, mean, weak, thin, delicate)
2
supernatural(abstract, shadowy, theoretical, ghastly, ethereal)
2
surface
2
surreal(adjective, strange, fantasy, unreal)
2
sylphlike(adjective, light, slight, easy, thin)
2
temporal
2
temporary
2
tottering(adjective, weakness, unstable, ill, feeble)
2
transient(adjective, temporary)
2
uncorporal(adjective, body, immaterial)
2
undependable(adjective, uncertain, feeble, shaky, hesitant)
2
unearthly(abstract, shadowy, theoretical, ghastly, ethereal)
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APASmart Define. (2016). insubstantial thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/insubstantial/thesaurus/synonyms
ChicagoSmart Define. 2016. "insubstantial thesaurus" https://smartdefine.org/insubstantial/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, insubstantial thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/insubstantial/thesaurus/synonyms>.
MLASmart Define. "insubstantial thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/insubstantial/thesaurus/synonyms>