53 entries under theoretical topic. ×

69
deep(noun, adjective, good, feeling, strong)
25
recondite(adjective, easy, obscure, deep, thoughtful)
21
abstruse(noun, adjective, easy, obscure, difficult)
9
intellectual(adjective, bright, deep, intelligent, thoughtful)
9
erudite(adjective, knowledge, deep, intelligent, thoughtful)
7
fundamental(adjective, abstract, abstruse, philosophical)
7
learned(adjective, deep, thoughtful, moral, intellectual)
3
philosophical(adjective, deep, thoughtful, intellectual, abstract)
2
abstract(hard, obscure, delicate, complex)
2
mystical(obscure, delicate, complex, mysterious, abstract)
2
reflective(adjective, deep, thoughtful, moral, intellectual)
2
sapient(sensible, wise, moral, shrewd)
2
transcendental(abstract, abstruse, philosophical)
1
bodiless(abstract, abstruse, philosophical)
1
discarnate(abstract, abstruse, philosophical)
1
eternal(deep, abstract, abstruse, philosophical)
1
high-flown(abstract, abstruse, philosophical)
1
ideal(abstract, abstruse, philosophical)
1
immaterial(abstract, abstruse, philosophical)
1
impalpable(abstract, abstruse, philosophical)
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APASmart Define. (2016). profound thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/profound/thesaurus/synonyms
ChicagoSmart Define. 2016. "profound thesaurus" https://smartdefine.org/profound/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, profound thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/profound/thesaurus/synonyms>.
MLASmart Define. "profound thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/profound/thesaurus/synonyms>