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constant
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continual
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continuous(noun, adjective)
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endless
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eternal
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everlasting
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permanent
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property
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repeated
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stable
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APASmart Define. (2016). perpetual thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/perpetual/thesaurus/broader
ChicagoSmart Define. 2016. "perpetual thesaurus" https://smartdefine.org/perpetual/thesaurus/broader (accessed September 23, 2026).
HarvardSmart Define 2016, perpetual thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/perpetual/thesaurus/broader>.
MLASmart Define. "perpetual thesaurus" 30 March 2016. Web. 23 September 2026. <https://smartdefine.org/perpetual/thesaurus/broader>