regressive

1. ADJ Regressive behaviour, activities, or processes involve a return to an earlier and less advanced stage of development. (行爲(wèi)、活動(dòng)或過(guò)程)退化的; 倒退的[正式]

...some of the symptoms of regressive behaviours: thumb sucking, bed wetting, having problems sleeping. ...倒退行爲(wèi)的一些癥狀：吮姆指、尿牀和睡眠不好。