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indefatigability

 - 3 dictionary results

in⋅de⋅fat⋅i⋅ga⋅ble

  [in-di-fat-i-guh-buhl]
Use indefatigability in a Sentence
–adjective
incapable of being tired out; not yielding to fatigue; untiring.
Origin:
1580–90; < L indēfatīgābilis untiring, equiv. to in- in- 3 + dēfatīgā(re) to tire out (see de-, fatigue ) + -bilis -ble

Related forms:
in⋅de⋅fat⋅i⋅ga⋅bil⋅i⋅ty, in⋅de⋅fat⋅i⋅ga⋅ble⋅ness, noun
in⋅de⋅fat⋅i⋅ga⋅bly, adverb

Synonyms:
tireless, inexhaustible, persevering.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To indefatigability
in·de·fat·i·ga·ble   (ĭn'dĭ-fāt'ĭ-gə-bəl)   
adj.  Incapable or seemingly incapable of being fatigued; tireless. See Synonyms at tireless.

[Obsolete French indéfatigable, from Latin indēfatīgābilis : in-, not; see in-1 + dēfatīgāre, to tire out (dē-, intensive pref.; see de- + fatīgāre, to weary).]
in'de·fat'i·ga·bil'i·ty, in'de·fat'i·ga·ble·ness n., in'de·fat'i·ga·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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