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2 entries under unsolvable topic. ×

1
impenetrable(adjective, obscure, dark, strange, odd)
1
indecipherable(dark, uncertain, mysterious, unfathomable, enigmatic)
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APASmart Define. (2015). sphinxlike thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sphinxlike/thesaurus/synonyms
ChicagoSmart Define. 2015. "sphinxlike thesaurus" https://smartdefine.org/sphinxlike/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, sphinxlike thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sphinxlike/thesaurus/synonyms>.
MLASmart Define. "sphinxlike thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/sphinxlike/thesaurus/synonyms>