decorous
在婚礼上，她穿着得体，举止优雅。
At the wedding, she wore a ___decorous dress and behaved gracefully.
学生们在客座教授的讲座中安静端坐，专注地做笔记。
The students sat in ___decorous silence during the guest professor's lecture, taking notes attentively.
家庭成员们在整场庄重的追思仪式中保持着得体的克制。
The family members maintained a ___decorous composure throughout the solemn memorial ceremony.