"Yes, you said that before," she said, impatiently.

impatiently 是副词，由形容词 impatient（不耐烦的）加上副词后缀 -ly 构成。impatient 由前缀 im-（表示否定）和 patient（耐心的）组成，字面意思是"不耐心"。impatiently 表示"不耐烦地"，描述说话时的态度或方式。