too numerous to count; innumerable: the countless stars.

1580–90; count1 + -less

countlessly, adverb

numberless, endless, myriad, unlimited. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
countless (ˈkaʊntlɪs)
innumerable; myriad

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"numberless, uncountable," 1580s, from count (v.) + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Countless printed pages record the travels and discoveries of two centuries.
Of him countless immortal lives, with countless embodiments and enjoyments.
Somewhere there is a website or book that created the error and now it has been
  replicated countless times.
When he wasn't carrying bags, he spent countless hours on the practice range.
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