Main Entry: in·de·fat·i·ga·ble

Pronunciation: \ˌin-di-ˈfa-ti-gə-bəl\

Function: adjective

Etymology: Middle French, from Latin indefatigabilis, from in- + defatigare to fatigue, from de- + fatigare to fatigue

Date: 1608

: 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