50 entries under dark topic. ×

40
obscure(adjective, hard, solid, strange)
36
cryptic(adjective, knowledge, evil, obscure)
29
puzzling(adjective, hard, knowledge, evil, obscure)
29
mystical(adjective, hard, knowledge, evil, obscure)
26
occult(noun, adjective, knowledge, evil, obscure)
24
mystic(adjective, knowledge, evil, obscure, solid)
24
recondite(adjective, evil, obscure, strange)
23
abstruse(noun, adjective, hard, evil, obscure)
23
inscrutable(adjective, strange, uncertain, secret)
20
esoteric(adjective, hard, evil, obscure)
19
incomprehensible(adjective, obscure, strange, secret)
18
secret(adjective, quiet, evil, obscure)
16
unfathomable(adjective, hard, obscure, strange)
15
unknown(adjective, obscure, secret, hidden)
14
inexplicable(adjective, hard, obscure, strange)
11
ambiguous(adjective, obscure, uncertain, doubtful)
8
equivocal(adjective, uncertain, doubtful, vague)
8
uncertain(adjective, uncertain, doubtful, vague)
7
unintelligible(adjective, hard, obscure, solid)
6
oracular(adjective, strange, uncertain, doubtful)
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APASmart Define. (2016). mysterious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/mysterious/thesaurus/synonyms
ChicagoSmart Define. 2016. "mysterious thesaurus" https://smartdefine.org/mysterious/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, mysterious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/mysterious/thesaurus/synonyms>.
MLASmart Define. "mysterious thesaurus" 24 February 2016. Web. 27 September 2026. <https://smartdefine.org/mysterious/thesaurus/synonyms>