She didn't think we were appropriately dressed for a wedding.

appropriately 是形容词 appropriate（适当的、合适的）加上副词后缀 -ly 构成的副词。appropriate 由前缀 ap-（表示"朝向"）和词根 propri（"自己的"）组成，字面意思是"归属于自己的"，引申为"恰当的"。 appropriately 表示"适当地、得体地"，在句中修饰动词 dressed，说明着装方式是否合适。