14 entries under abstruseness topic. ×

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bewitchment(perplexity, inscrutableness)
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confidential information(expression, perplexity, inscrutableness)
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hocuspocus(perplexity, inscrutableness)
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magic number(expression, perplexity, inscrutableness)
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occultism(perplexity, inscrutableness)
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privileged information(expression, perplexity, inscrutableness)
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puzzler(difficulty, question, puzzle, perplexity, mystery)
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runes(perplexity, inscrutableness)
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skeleton in cupboard(expression, idiom, perplexity, inscrutableness)
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voodooism(perplexity, inscrutableness)
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witchcraft(perplexity, inscrutableness)
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witchery(perplexity, inscrutableness)
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witching(perplexity, inscrutableness)
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wizardry(perplexity, inscrutableness)
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APASmart Define. (2016). closed book thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/closed_book/thesaurus/synonyms
ChicagoSmart Define. 2016. "closed book thesaurus" https://smartdefine.org/closed_book/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, closed book thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/closed_book/thesaurus/synonyms>.
MLASmart Define. "closed book thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/closed_book/thesaurus/synonyms>