indefatigable

[ in-di-fat-i-guh-buhl ]
See synonyms for indefatigable on Thesaurus.com
adjective

  1. incapable of being tired out; not yielding to fatigue; untiring.

Origin of indefatigable

1
1580–90; <Latin indēfatīgābilis untiring, equivalent to in-in-3 + dēfatīgā(re) to tire out (see de-, fatigue) + -bilis-ble

Other words for indefatigable

Other words from indefatigable

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

British Dictionary definitions for indefatigable

indefatigable

/ (ˌɪndɪˈfætɪɡəbəl) /

adjective

  1. unable to be tired out; unflagging

Origin of indefatigable

1
C16: from Latin indēfatīgābilis, from in- 1 + dēfatīgāre, from fatīgāre to tire

Derived forms of indefatigable

  • indefatigability or indefatigableness, noun
  • indefatigably, adverb

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

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