lighthearted

a. 快乐的, 心情愉快的

Showing or characterized by cheerfulness and lighthearted excitement; merry.

快乐的，愉快的表现出欢乐的、愉快的激动的，或具有其特征的；高兴的

He leans towards more lighthearted subjects in his later works.

他在後期的创作中倾向於比较轻松的主题。