350 entries under adjective topic. ×

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apparitional(fantastic, heavenly, unreal, theoretical)
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artificial(imaginary, illusory, dreamlike)
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chimeric(strange, fantasy, unreal)
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cranky(weakness, strange, fantasy, unreal)
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dainty(light, weak, slight, easy)
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dreamlike(negative, fantastic, heavenly, unreal)
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dreamy(gentle, obscure, marvelous, heavenly)
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empty(ineffective, fruitless)
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faint(dull, light, weak, soft)
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ghostly(obscure, vague, heavenly, incorporeal)
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gimcrack
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gossamery(light, slight, easy, thin)
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illogical(false, sense, unstable, ill)
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inconsequential(light, weak, soft, slight)
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less(inferior, smaller)
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meaningless(false, unreasonable, unimportant, trivial)
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otherworldly(excellent, gentle, strange, marvelous)
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phantasmal
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rarefied(fine, thin, delicate, slim)
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thick(thin, extraordinary, unreasonable, amazing)
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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>