When I asked for his opinion, he just shrugged and walked away passive-aggressively.

passive-aggressively 是由形容词 passive（被动的）和 aggressive（攻击性的）通过连字符连接，再加上副词后缀 -ly 构成的复合副词。passive 表示"消极的、被动的"，aggressive 表示"攻击性的、强势的"。passive-aggressive 合起来指"消极对抗的"，形容表面上顺从但实际用消极方式表达不满的行为方式。passive-aggressively 作为副词修饰"走开"这个动作。