9
unlimited(adjective, constant, abundant, unrestrained, endless)
8
aeonian
8
dateless
8
deathless(adjective, constant, abundant, unrestrained, endless)
8
long-lived(adjective, familiar, established, recurrent, returning)
8
nonstop(adjective, continue, steady, stable, regular)
8
repeated(adjective, steady, stable, regular, constant)
7
changeless(adjective, set, stable, regular, fixed)
7
chronic(adjective, usual, regular, routine, normal)
7
illimitable(adjective, constant, absolute, abundant, endless)
7
standing(verb, adjective, established, permanent)
7
unrelenting(adjective, determined, steady, persistent, constant)
6
boundless(adjective, constant, absolute, abundant, endless)
6
countless(adjective, constant, abundant, unrestrained, immense)
6
eonian
6
frequent(adjective, common, steady, regular, constant)
6
immeasurable(adjective, absolute, abundant, endless, infinite)
6
incalculable(adjective, constant, absolute, abundant, unrestrained)
6
indestructible(adjective, stable, moral, constant, unable)
6
inexhaustible(adjective, absolute, endless, immense, infinite)
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APASmart Define. (2016). perpetual thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/perpetual/thesaurus/synonyms
ChicagoSmart Define. 2016. "perpetual thesaurus" https://smartdefine.org/perpetual/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, perpetual thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/perpetual/thesaurus/synonyms>.
MLASmart Define. "perpetual thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/perpetual/thesaurus/synonyms>