noun
physical or mental strength and endurance
adjective
stamina does not have an applicable adjective
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Athletes need to build up their stamina in order to perform at their best during competitions.
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I need to work on my stamina if I want to keep up with my friends on our hiking trips.
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Dude, I was impressed by your stamina at the gym today. You killed it!
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Mental stamina is just as important as physical stamina when facing challenges in life.