unwearied, unwearying, untiring, indefatigable, unflagging, incessant, hard-working, strenuous, energetic, resolute, steadfast, persevering; see also active 2, enthusiastic 1, 3.
Antonyms tired*, weak, listless.
"tireless." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/tireless>.
tireless. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/tireless
Having or showing a capacity for protracted effort, regardless of difficulty or frustration:
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