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
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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
They are bred to herd sheep indefatigably all day long.
And when the war seemed necessary, he bravely and indefatigably persuaded his country to join in the heroic venture.
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