indefatigable, unwearied, unflagging, unsleeping; see active 2, tireless.
limitless, unbounded, boundless, never-ending; see endless 1, infinite 1, unlimited.
"inexhaustible." YourDictionary, n.d. Web. 12 October 2018. <http://thesaurus.yourdictionary.com/inexhaustible>.
inexhaustible. (n.d.). Retrieved October 12th, 2018, from http://thesaurus.yourdictionary.com/inexhaustible
Having or showing a capacity for protracted effort, regardless of difficulty or frustration:
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