81 entries under expression topic. ×

21
closed book(noun, idiom, trouble, challenge)
8
mystery story(noun, idiom)
3
fairy tale(noun, excitement, fancy, color)
2
classified information
2
tough nut to crack(noun, idiom, difficulty, secret)
1
miracle play(idiom, the drama)
1
profound secret(idiom, secret)
1
sealed book(idiom, secret)
1
stage play(idiom, the drama)
1
confidential information(noun, confidence, perplexity, abstruseness)
1
line of business
1
line of work
1
matter of ignorance
1
mode of worship
1
mystery of mysteries
1
nut to crack
1
order of worship
1
sixty-four-thousand-dollar question(noun, difficulty, question, secret)
1
sixty-four dollar question
1
theater of cruelty
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APASmart Define. (2016). mystery thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/mystery/thesaurus/synonyms
ChicagoSmart Define. 2016. "mystery thesaurus" https://smartdefine.org/mystery/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, mystery thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/mystery/thesaurus/synonyms>.
MLASmart Define. "mystery thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/mystery/thesaurus/synonyms>