The children that travel become very restless when they cannot see any movies or are not offered any games or any other entertainment from the staff.

restless 是由形容词 rest（休息、静止）加上后缀 -less（表示“没有”）构成的形容词，字面意思是“没有休息的”，引申为“焦躁不安的、坐立不安的”。用来描述因无聊或缺乏活动而产生的烦躁情绪。