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characteristic
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tough
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APASmart Define. (2015). hard-line thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/hard-line/thesaurus/broader
ChicagoSmart Define. 2015. "hard-line thesaurus" https://smartdefine.org/hard-line/thesaurus/broader (accessed September 24, 2026).
HarvardSmart Define 2015, hard-line thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/hard-line/thesaurus/broader>.
MLASmart Define. "hard-line thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/hard-line/thesaurus/broader>