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brick wall(adjective, hard, compact, dense)
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APASmart Define. (2013). rock-hard thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rock-hard/thesaurus/synonyms
ChicagoSmart Define. 2013. "rock-hard thesaurus" https://smartdefine.org/rock-hard/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, rock-hard thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rock-hard/thesaurus/synonyms>.
MLASmart Define. "rock-hard thesaurus" 17 June 2013. Web. 23 September 2026. <https://smartdefine.org/rock-hard/thesaurus/synonyms>