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English definition of “youthful”

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adjective  /ˈjuθ·fəl/ us  
characteristic of young people, or relating to the period of life when you are young: Her youthful enthusiasm always makes her seem ageless.
noun [U]  /ˈjuθ·fəl·nəs/ us  
Her voice has just the right mix of maturity (= a quality like that of an adult) and youthfulness.
(Definition of youthful from the Cambridge Academic Content Dictionary © Cambridge University Press)
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