adj.
Pronunciation: ˌ in-di- ' fa-ti-g ə -b ə l
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 \ - ˌ fa-ti-g ə - ' bi-l ə -t ē \ noun
– in · de · fat · i · ga · ble · ness \ - ' fa-ti-g ə -b ə l-n ə s \ noun
– in · de · fat · i · ga · bly \ -bl ē \ adverb