Etymology
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countless (adj.)

"numberless, uncountable," 1580s, from count (v.) + -less.

updated on September 28, 2012

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Definitions of countless from WordNet

countless (adj.)
too numerous to be counted;
countless hours
Synonyms: infinite / innumerable / innumerous / multitudinous / myriad / numberless / uncounted / unnumberable / unnumbered / unnumerable
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.