22
innumerable(adjective, great, big, infinite, myriad)
20
numberless(adjective, complete, constant, absolute, monotonous)
18
myriad(noun, adjective, great, considerable, various)
15
immeasurable(adjective, great, complete, big, infinite)
15
incalculable(adjective, complete, big, absolute, indefinite)
15
infinite(adjective, great, big, endless, immense)
14
multitudinous(adjective, considerable, immense, infinite, unfathomable)
13
measureless(adjective, big, endless, immense, infinite)
12
uncountable(adjective, great, big, immense, infinite)
12
uncounted(adjective, innumerable)
11
limitless(adjective, complete, indefinite, immense, infinite)
11
unnumbered(adjective, infinity)
11
untold(adjective, endless, immense, infinite, limitless)
10
endless(adjective, great, complete, full, immense)
10
numerous(adjective, great, considerable, various, myriad)
10
unlimited(adjective, complete, abundant, extensive, immense)
9
many(adjective, abundant, profuse, numerous, innumerable)
9
boundless(adjective, complete, constant, absolute, monotonous)
9
illimitable(adjective, complete, endless, immense, infinite)
8
great
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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>