adjective
showing sustained enthusiastic action with unflagging vitality
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Despite facing numerous obstacles, the indefatigable researcher continued to pursue groundbreaking discoveries.
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My grandma is truly indefatigable when it comes to tending to her garden every day.
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That guy is like an indefatigable energizer bunny, he never seems to run out of energy.
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The indefatigable spirit of the protesters could not be dampened by the rain or cold weather.