in·de·fat·i·ga·ble

[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

in·de·fat·i·ga·bil·i·ty, in·de·fat·i·ga·ble·ness, noun
in·de·fat·i·ga·bly, adverb


tireless, inexhaustible, persevering.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
indefatigable (ˌɪndɪˈfætɪɡəbəl) [Click for IPA pronunciation guide]
 
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
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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
His only delight was in exercises of piety and in his studies, in which he
  employed his whole time with indefatigable application.
He is an adventurous and indefatigable traveler as well as a brilliant explorer
  of arcane problems and archives.
She was indefatigable, which made her abrupt exit even harder to take.
His work and his indefatigable spirit will be deeply missed, but his legacy
  will never be forgotten.
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