indefatigable


in·de·fat·i·ga·ble

adjective \ˌin-di-ˈfa-ti-gə-bəl\

: able to work or continue for a very long time without becoming tired

Full Definition of INDEFATIGABLE

:  incapable of being fatigued :  untiring <an indefatigable worker>
in·de·fa·ti·ga·bil·i·ty \-ˌfa-ti-gə-ˈbi-lə-tē\ noun
in·de·fat·i·ga·ble·ness \-ˈfa-ti-gə-bəl-nəs\ noun
in·de·fat·i·ga·bly \-blē\ adverb

Examples of INDEFATIGABLE

  1. a person of indefatigable patience
  2. <an indefatigable laborer who can work from sunrise to sunset>

Origin of INDEFATIGABLE

Middle French, from Latin indefatigabilis, from in- + defatigare to fatigue, from de- + fatigare to fatigue
First Known Use: 1608

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