tireless

[tahyuhr-lis]
adjective
untiring; indefatigable: a tireless worker.

Origin:
1585–95; tire1 + -less

tirelessly, adverb
tirelessness, noun


unwearied, industrious, hardworking, unfaltering.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tireless (ˈtaɪəlɪs)
 
adj
unable to be tired; indefatigable
 
'tirelessly
 
adv
 
'tirelessness
 
n

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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Example sentences
Computers are tireless number crunchers and prodigious data repositories.
His humour, such as it is, is tireless and inexhaustible.
But, whatever blots there may have been upon his honour, he was tireless in
  industry.
But, by a curious irony, neither poverty nor the bottle impaired the tireless
  industry of the hacks.
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