5
protracted(adjective, endless, infinite, boundless, incessant)
5
sodding
5
stark
5
thoroughgoing
5
unbounded(adjective, constant, absolute, abundant, unrestrained)
4
arrant
4
chronic(adjective, persistent, constant, continuous, endless)
4
extended
4
illimitable(adjective, constant, absolute, abundant, endless)
4
immeasurable(adjective, absolute, abundant, endless, infinite)
4
immemorial(adjective, infinite)
4
indissoluble(adjective, strong, enduring, permanent, eternal)
4
lengthy(adjective, durable)
4
lifelong(adjective, permanent, durable, recurrent, perpetual)
4
long-lived
4
long-winded(adjective, endless, incessant, ceaseless)
4
monotonous(adjective, persistent, constant, abundant, continuous)
4
regular(adjective, steady, fixed, persistent, constant)
4
relentless(adjective, continue, steady, persistent, constant)
4
staring
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APASmart Define. (2016). everlasting thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/everlasting/thesaurus/synonyms
ChicagoSmart Define. 2016. "everlasting thesaurus" https://smartdefine.org/everlasting/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, everlasting thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/everlasting/thesaurus/synonyms>.
MLASmart Define. "everlasting thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/everlasting/thesaurus/synonyms>