7 entries under expression topic. ×

1
classified information(noun, confidence, mystery)
1
magic number(noun, confidence, secret, perplexity)
1
privileged information(noun, confidence, secret, perplexity)
0
closed book(perplexity, abstruseness, inscrutableness)
0
skeleton in cupboard(idiom, confidence, secret, perplexity)
0
skeleton in the cupboard(idiom, confidence, mystery)
0
tough nut to crack(idiom, perplexity, abstruseness, inscrutableness)
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APASmart Define. (2015). confidential information thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/confidential_information/thesaurus/synonyms
ChicagoSmart Define. 2015. "confidential information thesaurus" https://smartdefine.org/confidential_information/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, confidential information thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/confidential_information/thesaurus/synonyms>.
MLASmart Define. "confidential information thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/confidential_information/thesaurus/synonyms>