having or seeming to have no end, limit, or conclusion; boundless; infinite; interminable; incessant: an endless series of complaints; Time is endless.
made continuous, as by joining the two ends of a single length: an endless chain or belt.

before 900; Middle English endelees, Old English endelēas. See end1, -less

endlessly, adverb
endlessness, noun
quasi-endless, adjective
quasi-endlessly, adverb

1. limitless, illimitable, unending, unceasing, continuous, perpetual. See eternal.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
endless (ˈɛndlɪs)
1.  having or seeming to have no end; eternal or infinite
2.  continuing too long or continually recurring
3.  formed with the ends joined: an endless belt

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. endeleas; see end + -less. Related: Endlessly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Botanical prints are an endless delight-especially the old ones.
There are so many great cotton, canvas, even hemp bags available now in endless
  sizes and styles.
The possibilities for soda-flavored cakes are nearly endless.
These tales have spawned legal battles, comics-page yarns, and endless
  dinner-table diversion.
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