15 entries under idiom topic. ×

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tough nut to crack(expression, question, secret, puzzle)
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Riddle of the Sphinx
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crux criticorum(expression, secret)
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crystal gazer(expression, oracle)
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egyptian lion-like statue
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fortune teller(expression, oracle)
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hawk moth
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mythical creature
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mythical monster
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nut to crack(expression, secret)
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sea serpent(expression, unconformity)
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sibylline leaves
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skeleton in cupboard(expression, perplexity, abstruseness, inscrutableness)
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sphinx's riddle
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star gazer(expression, oracle)
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APASmart Define. (2015). sphinx thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sphinx/thesaurus/synonyms
ChicagoSmart Define. 2015. "sphinx thesaurus" https://smartdefine.org/sphinx/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, sphinx thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sphinx/thesaurus/synonyms>.
MLASmart Define. "sphinx thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/sphinx/thesaurus/synonyms>