22 entries under solid topic. ×

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sibylline(dense, unfathomable, unintelligible, impassable)
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ungraspable(dense, unfathomable, unintelligible, impassable)
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APASmart Define. (2015). enigmatical thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/enigmatical/thesaurus/synonyms
ChicagoSmart Define. 2015. "enigmatical thesaurus" https://smartdefine.org/enigmatical/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, enigmatical thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/enigmatical/thesaurus/synonyms>.
MLASmart Define. "enigmatical thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/enigmatical/thesaurus/synonyms>