inexhaustible, unwearied, tireless; see active 2, tireless.
"indefatigable." YourDictionary, n.d. Web. 11 October 2018. <http://thesaurus.yourdictionary.com/indefatigable>.
indefatigable. (n.d.). Retrieved October 11th, 2018, from http://thesaurus.yourdictionary.com/indefatigable
Having or showing a capacity for protracted effort, regardless of difficulty or frustration:
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