86 entries under theoretical topic. ×

15
conceptual(adjective, rational, intellectual, immaterial)
14
ideal(adjective, perfect, extraordinary, superior, fantastic)
14
notional(adjective, intellectual, risky, imaginary, unreal)
13
hypothetical(adjective, obscure, extraordinary, superior, fantastic)
12
speculative(adjective, wild, unreasonable, useless, absurd)
11
academic(adjective, philosophy, vague, general, logical)
11
intellectual(adjective, obscure, extraordinary, rational, fantastic)
9
intangible(adjective, intellectual, supernatural, indefinite, spiritual)
9
metaphysical(adjective, physical, fantastic, moral, logical)
9
philosophical(adjective, moral, intellectual, supernatural, logical)
9
unpractical(adjective, unreasonable, unviable)
8
pure(adjective, vague, intellectual, logical, imaginary)
8
transcendent(adjective, extraordinary, beautiful, real, intellectual)
7
transcendental(adjective, perfect, fantastic, beautiful, real)
6
abstruse(noun, adjective, hard, difficult, heavy)
6
conjectural(adjective, vague, intellectual, general, logical)
6
deep(adjective, hard, delicate, complex)
6
impalpable(adjective, insubstantial, imperceptible, immaterial)
6
theoretic(adjective, real, thoughts)
5
hypothetic(adjective, real)
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APASmart Define. (2015). abstract thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/abstract/thesaurus/synonyms
ChicagoSmart Define. 2015. "abstract thesaurus" https://smartdefine.org/abstract/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, abstract thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/abstract/thesaurus/synonyms>.
MLASmart Define. "abstract thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/abstract/thesaurus/synonyms>