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countless

[kount-lis]
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adjective
  1. too numerous to count; innumerable: the countless stars.
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Origin of countless

First recorded in 1580–90; count1 + -less
Related formscount·less·ly, adverb

Synonyms

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numberless, endless, myriad, unlimited.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for countlessly

countless

adjective
  1. innumerable; myriad
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for countlessly

countless

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper