adjective
describing someone or something that does not tire easily; showing great effort or determination
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Her tireless work ethic has earned her numerous accolades in the business world.
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He's a tireless worker, always putting in extra hours to get the job done.
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She's a tireless hustler, always grinding to make ends meet.
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The tireless waves crashed against the shore, never ceasing in their relentless pursuit of the land.