indefatigability

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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