The antonyms have distinct nuances: *Youthfulness* conveys a state of being young, energetic, and enthusiastic, while *immaturity* denotes a lack of development, experience, and responsibility. Use these words to enhance communication, show empathy in conversations, and enrich storytelling by creating relatable characters and compelling narratives.

수녀의 *젊음*은 삶에 대한 에너지와 열정에서 분명하게 드러났다.

彼女の*若さ*は、彼女のエネルギーと人生への熱意に明らかでした。

Her *youthfulness* was evident in her energy and enthusiasm for life.

그의 *미성숙함*은 그의 충동적인 행동과 책임감 부족에서 분명했습니다.

彼の*未熟さ*は、彼の衝動的な行動と責任の欠如から明らかでした。

His *immaturity* was apparent in his impulsive behavior and lack of responsibility.