《宋书·志·卷三十》
无颜，是惭愧的意思；头发覆盖额头，是惭愧的形貌；束系头发非常松散，象征天下忘记了礼义，放纵情性，到了最终，将要遭受大的耻辱。
无颜者，愧之言也；覆额者，惭之貌；其缓弥甚，言天下忘礼与义，放纵情性，及其终极，至乎大耻也。
“Faceless” means “ashamed”; hair covering the forehead is a sign of shame; the hair being tied very loosely, symbolizes that the world has forgotten about etiquette and is indulging its nature; in the end, it will suffer great humiliation.