78 entries under unknown topic. ×

32
recondite(adjective, sound, easy, evil, sharp)
29
obscure(adjective, hard, sharp, difficult, dark)
24
deep(adjective, hard, sound, easy, evil)
24
mysterious(adjective, hard, evil, obscure, dark)
18
arcane(adjective, evil, obscure, difficult, strange)
18
esoteric(adjective, hard, sound, easy, evil)
16
occult(noun, adjective, evil, obscure, dark)
14
cryptic(adjective, evil, sharp, obscure, difficult)
8
mystic(adjective, evil, obscure, dark, deep)
6
ambiguous(adjective, obscure, strange, uncertain, doubtful)
6
concealed(adjective, evil, obscure, difficult, dark)
5
mystical(adjective, hard, evil, obscure, dark)
4
transcendental(strange, intellectual, abstract, theoretical)
3
covert(strange, secret, hidden, curious)
3
equivocal(adjective, obscure, difficult, dark, strange)
3
hermetic(obscure, dark, deep, mysterious, secret)
3
shadowy(adjective, obscure, dark, hidden)
2
close(obscure, dark, secret, hidden)
2
clouded(obscure, dark, secret, hidden)
2
covered(obscure, secret, hidden, concealed)
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APASmart Define. (2015). abstruse thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/abstruse/thesaurus/synonyms
ChicagoSmart Define. 2015. "abstruse thesaurus" https://smartdefine.org/abstruse/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, abstruse thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/abstruse/thesaurus/synonyms>.
MLASmart Define. "abstruse thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/abstruse/thesaurus/synonyms>