Still, I find Edmund's character disturbing and I do not believe that his background alone could have created such an evil human being.

disturbing 是动词 disturb 的现在分词形式，disturb 的意思是"打扰、使不安"，加上-ing 变成形容词，表示"令人不安的、使人困扰的"。 这里 disturbing 用来描述埃德蒙的性格特征，表示他的性格让人感到不安或不适。