8
innumerous(adjective, great, untidy, considerable, immense)
8
vast(adjective, complete, immense, infinite, incalculable)
7
interminable(adjective, complete, constant, absolute, abundant)
7
perpetual(adjective, constant, abundant, unrestrained, immense)
7
unbounded(adjective, complete, indefinite, immense, infinite)
6
eternal(adjective, constant, abundant, unrestrained, infinite)
6
immense(adjective, complete, absolute, indefinite, infinite)
6
inexhaustible(adjective, vast, endless, immense, infinite)
6
legion(adjective, numerous, innumerable)
6
umpteen(adjective, many, innumerable)
6
unnumberable
5
large
5
unfathomable(constant, abundant, unrestrained, immense, infinite)
4
abundant(adjective, numerous)
4
ample(adjective, numerous)
4
incomprehensible(adjective, complete, absolute, unrestrained, extensive)
4
incomputable(adjective, big, incalculable)
4
much(adjective, plenty)
4
termless(adjective, infinite, infinity)
4
unmeasured
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APASmart Define. (2015). countless thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/countless/thesaurus/synonyms
ChicagoSmart Define. 2015. "countless thesaurus" https://smartdefine.org/countless/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, countless thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/countless/thesaurus/synonyms>.
MLASmart Define. "countless thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/countless/thesaurus/synonyms>