80 entries under unknown topic. ×

40
obscure(adjective, hard, solid, dark, strange)
36
cryptic(adjective, knowledge, evil, obscure, dark)
29
mystical(adjective, hard, knowledge, evil, obscure)
28
arcane(adjective, knowledge, evil, obscure, solid)
26
occult(noun, adjective, knowledge, evil, obscure)
25
dark(adjective, obscure, hidden, secret, strange)
24
mystic(adjective, knowledge, evil, obscure, solid)
24
recondite(adjective, evil, obscure, dark, strange)
23
abstruse(noun, adjective, hard, evil, obscure)
20
esoteric(adjective, hard, evil, obscure, dark)
13
deep(adjective, hard, evil, obscure, heavy)
11
ambiguous(adjective, obscure, dark, uncertain, doubtful)
8
concealed(adjective, evil, obscure, strange, new)
7
romantic(adjective, happy, unusual, striking)
7
unintelligible(adjective, hard, obscure, solid, dark)
6
unidentified(adjective, strange, new, remote, secret)
5
furtive(adjective, obscure, strange, secret, private)
5
latent(obscure, dark, secret, hidden)
5
undisclosed(obscure, dark, secret, hidden)
5
unexplored(strange, new, remote, indefinite)
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APASmart Define. (2016). mysterious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/mysterious/thesaurus/synonyms
ChicagoSmart Define. 2016. "mysterious thesaurus" https://smartdefine.org/mysterious/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, mysterious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/mysterious/thesaurus/synonyms>.
MLASmart Define. "mysterious thesaurus" 24 February 2016. Web. 25 September 2026. <https://smartdefine.org/mysterious/thesaurus/synonyms>