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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World English Dictionary
tireless (ˈtaɪəlɪs)
 
adj
unable to be tired; indefatigable
 
'tirelessly
 
adv
 
'tirelessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Researchers are tirelessly working on ways to combat mental illness.
Regardless of gender or religion, the country worked tirelessly as a unit to
  change their history.
Nightingale worked tirelessly caring for the soldiers.
Bearing in mind what is at stake, tirelessly underlining this point is
  ridiculous.
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