68 entries under abstract topic. ×

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fundamental(adjective, supernatural, theoretical, philosophical)
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high-flown(theoretical, philosophical)
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impalpable(theoretical, philosophical)
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incorporeal(theoretical, philosophical)
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insubstantial(theoretical, philosophical)
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jesuitic(theoretical, philosophical)
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mystical(theoretical, philosophical)
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no go(expression, wild, unreasonable, useless, absurd)
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nonmaterial(theoretical, philosophical)
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nonphysical(theoretical, philosophical)
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numinous(theoretical, philosophical)
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ontological(theoretical, philosophical)
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oversubtle(theoretical, philosophical)
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philosophic(thoughtful, theoretical, pensive, reflective)
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preternatural(theoretical, philosophical)
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profound(thoughtful, theoretical, pensive, philosophical)
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recondite(theoretical, philosophical)
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spiritual(theoretical, philosophical)
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superhuman(theoretical, philosophical)
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superior(theoretical, philosophical)
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APASmart Define. (2015). speculative thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/speculative/thesaurus/synonyms
ChicagoSmart Define. 2015. "speculative thesaurus" https://smartdefine.org/speculative/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, speculative thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/speculative/thesaurus/synonyms>.
MLASmart Define. "speculative thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/speculative/thesaurus/synonyms>