62 entries under deep topic. ×

2
inexplicable(adjective, hard, strange, tricky)
2
learned(obscure, thoughtful, precise, knowledgeable)
2
scholarly(obscure, complex, thoughtful, modern)
2
serious(intense, heavy, fierce, thoughtful)
2
veiled(adjective, obscure, strange, mysterious)
2
weighty(thoughtful, reflective)
2
wise(thoughtful, reflective)
1
Delphian(adjective, evil, obscure, strange)
1
acroamatic(adjective, hard, obscure, difficult, heavy)
1
anagogic(adjective, evil, mysterious, secret)
1
eternal(abstract, theoretical, profound, philosophical)
1
intellectual(sound, thoughtful, knowledgeable, abstract)
1
invisible(obscure, dark, mysterious, unknown)
1
magic(obscure, mysterious, supernatural, spiritual)
1
magical(obscure, strange, mysterious, unknown)
1
orphic(obscure, complex, thoughtful, mysterious)
1
philosophical(sound, thoughtful, intellectual, abstract)
1
preternatural(obscure, mysterious, supernatural, abstract)
1
sage(thoughtful, knowledgeable, cultured, educated)
1
skilled(sound, thoughtful, knowledgeable, cultured)
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APASmart Define. (2015). abstruse thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/abstruse/thesaurus/synonyms
ChicagoSmart Define. 2015. "abstruse thesaurus" https://smartdefine.org/abstruse/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, abstruse thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/abstruse/thesaurus/synonyms>.
MLASmart Define. "abstruse thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/abstruse/thesaurus/synonyms>