Idiomatic translation of "passive aggressive"
To literally translate " passive aggressive" as 「被動攻擊」or 「消極攻擊」cannot capture the essence of this phrase. It is better to use interpretation that truly express the meaning of it.

My choice is " 陰損" 


  http://tw.ichacha.net/hy/陰損.html
  
  ①陰險尖刻：說話～。