She clearly disagreed with the decision but just smiled and nodded, then passive-aggressively delayed carrying it out.

passive-aggressively 是由形容词 passive（被动的）和形容词 aggressive（攻击性的）加上后缀 -ly 构成的副词。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"消极抵抗的"，即表面上顺从但实际用拖延、低效等方式暗中抵抗的行为方式。passive-aggressively 作为副词，描述"以消极抵抗的方式"进行某个动作。