noun
the quality or state of being youthful or young in appearance, behavior, or attitude
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The artist's work is often characterized by a sense of juvenility, reflecting his youthful spirit.
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Her juvenility really shines through in her playful personality and carefree attitude.
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I can't believe he still has that juvenility about him, always goofing around like a kid.
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The garden seemed to come alive with the juvenility of spring, as flowers bloomed and birds chirped in the trees.