adjective Etymology: Middle French, from Latin indefatigabilis, from in- + defatigare to fatigue, from de- + fatigare to fatigue Date: 1608 incapable of being fatigued ; untiring , indefatigability noun ~ness noun indefatigably adverb
INDEFATIGABLE
Meaning of INDEFATIGABLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012