随着考试一再推迟，学生们的不安情绪逐渐加剧。

The students' restiveness increased as the exam was repeatedly postponed.

restiveness 是由形容词 restive（不安的、焦躁的）加上名词后缀 -ness 构成的名词。restive 本身来自动词 rest（休息），引申为"无法安静、躁动不安"的状态。restiveness 表示"不安、焦躁"的情绪状态。