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Perseverant (adjective)
Enduring; persistent, resistant.
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Persevering (noun)
perseverance
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Persevering (adjective)
Tending to persevere.
Wiktionary
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Perseverant (adjective)
persistent in doing something despite difficulty; unwavering
“you need to be spirited and perseverant to drive your projects through”
“if you have a perseverant mind, you will work until all problems are resolved”
Oxford Dictionary