78 entries under unknown topic. ×

1
insoluble(strange, curious, concealed, inexplicable)
1
invisible(obscure, dark, deep, mysterious)
1
magical(obscure, strange, deep, mysterious)
1
necromantic(strange, supernatural, spiritual, curious)
1
oracular(strange, curious, concealed, inexplicable)
1
out-of-the-way(obscure, complex, clandestine, underground)
1
out of view(expression, idiom, obscure, dark)
1
reticent(obscure, clandestine, underground, undisclosed)
1
retired(obscure, clandestine, underground, undisclosed)
1
screened(obscure, dark, secret, hidden)
1
secretive(strange, clandestine, underground, curious)
1
shrouded(adjective, obscure, secret, hidden)
1
spiritual(strange, supernatural, abstract, theoretical)
1
strange(obscure, clandestine, underground, undisclosed)
1
subjective(strange, curious, concealed, inexplicable)
1
surreptitious(secret, hidden, underground, concealed)
1
symbolic(strange, curious, concealed, inexplicable)
1
uncanny(strange, curious, concealed, inexplicable)
1
undetected(obscure, dark, secret, hidden)
1
undisclosed(obscure, dark, secret, hidden)
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APASmart Define. (2015). abstruse thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/abstruse/thesaurus/synonyms
ChicagoSmart Define. 2015. "abstruse thesaurus" https://smartdefine.org/abstruse/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, abstruse thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/abstruse/thesaurus/synonyms>.
MLASmart Define. "abstruse thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/abstruse/thesaurus/synonyms>