tire·less

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

Origin:
1585–95; tire1 + -less

tire·less·ly, adverb
tire·less·ness, noun


unwearied, industrious, hardworking, unfaltering.
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World English Dictionary
tireless (ˈtaɪəlɪs) [Click for IPA pronunciation guide]
 
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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00:10
Tireless is always a great word to know.
So is bezoar. Does it mean:
a chattering or flighty, light-headed person.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
Horses have been our faithful servants, our tireless comrades, and our loyal
  friends.
And machines may be our mates and a sympathetic tireless ear.
His humour, such as it is, is tireless and inexhaustible.
He is a leader in his field and is certainly an ingenious and tireless
  researcher.
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