indefatigable

[in-di-fat-i-guh-buhl]
adjective
incapable of being tired out; not yielding to fatigue; untiring.

Origin:
1580–90; < Latin indēfatīgābilis untiring, equivalent to in- in-3 + dēfatīgā(re) to tire out (see de-, fatigue) + -bilis -ble

indefatigability, indefatigableness, noun
indefatigably, adverb


tireless, inexhaustible, persevering.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
indefatigable (ˌɪndɪˈfætɪɡəbəl)
 
adj
unable to be tired out; unflagging
 
[C16: from Latin indēfatīgābilis, from in-1 + dēfatīgāre, from fatīgāre to tire]
 
indefatiga'bility
 
n
 
inde'fatigableness
 
n
 
inde'fatigably
 
adv

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

indefatigable
1586 (implied in indefatigably), from Fr. indefatigable (15c.), from L. indefatigabilis "that cannot be wearied," from in- "not" + defatigare "to tire out," from de- "utterly, down, away" + fatigare "to weary" (see fatigue).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He has an upbeat spirit that is truly indefatigable-even a blast of squid ink to the face won't put him off.
And my indefatigable guides scoured antique shops with me to salvage letters
  that might eventually have been thrown away.
She was indefatigable, which made her abrupt exit even harder to take.
Wood became an indefatigable promoter of standardized testing.
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