Meaning of “youthful” in the English Dictionary

"youthful" in British English

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youthfuladjective

uk /ˈjuːθ.fəl/ us /ˈjuːθ.fəl/ approving
youthfully
adverb uk /ˈjuːθ.fəl.i/ us /ˈjuːθ.fəl.i/
youthfulness
noun [ U ] uk /ˈjuːθ.fəl.nəs/ us /ˈjuːθ.fəl.nəs/

(Definition of “youthful” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"youthful" in American English

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youthfuladjective

us /ˈjuθ·fəl/

characteristic of young people, or relating to the period of life when you are young:

Her youthful enthusiasm always makes her seem ageless.
youthfulness
noun [ U ] us /ˈjuθ·fəl·nəs/

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)