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21 entries under hardened topic. ×

1
usual(persistent, customary, lasting, habitual)
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APASmart Define. (2015). long-standing thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/long-standing/thesaurus/synonyms
ChicagoSmart Define. 2015. "long-standing thesaurus" https://smartdefine.org/long-standing/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, long-standing thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/long-standing/thesaurus/synonyms>.
MLASmart Define. "long-standing thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/long-standing/thesaurus/synonyms>