| spiritual(adjective, abstract, immaterial, abstruse, philosophical) | |
| unproven | |
| unsubstantial(adjective, fantastic, abstract, imaginary, unreal) | |
| untested | |
| visionary(adjective, fake, false, wild, unreasonable) | |
| axiomatic(adjective, important, significant, original, basic) | |
| basic(adjective, important, significant, original, essential) | |
| chimerical(adjective, fake, false, wild, unreasonable) | |
| discarnate(abstract, abstruse, philosophical) | |
| erudite(adjective, academic) | |
| ethereal(adjective, immaterial) | |
| fictitious(adjective, fake, false, fantastic, intellectual) | |
| fundamental(adjective, important, original, essential, basic) | |
| gratuitous | |
| made-up(fantastic, unreal, fictitious, invented, speculative) | |
| mythical(fake, false, imaginary, fanciful, illusory) | |
| nominal | |
| nonfigurative | |
| nonobjective | |
| nonrepresentational |
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| APA | Smart Define. (2015). theoretical thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/theoretical/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "theoretical thesaurus" https://smartdefine.org/theoretical/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, theoretical thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/theoretical/thesaurus/synonyms>. |
| MLA | Smart Define. "theoretical thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/theoretical/thesaurus/synonyms> |