follow Dictionary.com

How do you spell Hannukah?

indefatigable

[in-di-fat-i-guh-buh l] /ˌɪn dɪˈfæt ɪ gə bəl/
adjective
1.
incapable of being tired out; not yielding to fatigue; untiring.
Origin
1580-1590
1580-90; < Latin indēfatīgābilis untiring, equivalent to in- in-3 + dēfatīgā(re) to tire out (see de-, fatigue) + -bilis -ble
Related forms
indefatigability, indefatigableness, noun
indefatigably, adverb
Synonyms
tireless, inexhaustible, persevering.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for indefatigableness

indefatigable

/ˌɪndɪˈfætɪɡəbəl/
adjective
1.
unable to be tired out; unflagging
Derived Forms
indefatigability, indefatigableness, noun
indefatigably, adverb
Word Origin
C16: from Latin indēfatīgābilis, from in-1 + dēfatīgāre, from fatīgāre to tire
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for indefatigableness

indefatigable

adj.

1580s (implied in indefatigably), from French indefatigable (15c.), from Latin indefatigabilis "that cannot be wearied," from in- "not" (see in- (1)) + defatigare "to tire out," from de- "utterly, down, away" + fatigare "to weary" (see fatigue).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for indefatigable

Few English speakers likely know this word

Word Value for indefatigableness

0
29
Scrabble Words With Friends