He walked away disconsolately, his head hanging low.

disconsolately 是副词，由形容词 disconsolate 加后缀 -ly 构成。disconsolate 由前缀 dis-（表示"否定、相反"）和 consolate（安慰）组成，意思是"无法被安慰的、极度沮丧的"。disconsolately 表示"沮丧地、闷闷不乐地"。