91 entries under mysterious topic. ×

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foul(adjective, evil, threatening, nefarious)
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frowning(adjective, evil, threatening, nefarious)
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glowering(adjective, evil, threatening, nefarious)
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glum(adjective, evil, threatening, nefarious)
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guarded(cover, obscure, dark, private)
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hellish(adjective, evil, threatening, nefarious)
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horrible(adjective, evil, threatening, nefarious)
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hushed(private, reticent, taciturn, covert)
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immoral(adjective, evil, threatening, nefarious)
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infamous(adjective, evil, threatening, nefarious)
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infernal(adjective, evil, threatening, nefarious)
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nasty(adjective, evil, threatening, nefarious)
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nefarious(adjective, evil, threatening, spooky)
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not known(expression, adjective, evil, deep)
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reserved(private, reticent, taciturn, uncommunicative)
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satanic(adjective, evil, threatening, nefarious)
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scowling(adjective, evil, threatening, nefarious)
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silent(private, reticent, taciturn, uncommunicative)
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sinful(adjective, evil, threatening, nefarious)
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stickling(dark, uncertain)
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APASmart Define. (2016). cryptic thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/cryptic/thesaurus/synonyms
ChicagoSmart Define. 2016. "cryptic thesaurus" https://smartdefine.org/cryptic/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, cryptic thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/cryptic/thesaurus/synonyms>.
MLASmart Define. "cryptic thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/cryptic/thesaurus/synonyms>