As Apple and several security experts have argued, an order compelling Apple to write software that gives the Fbi access to the iPhone in question would establish an unsettling precedent.
2017年12月六级真题（第三套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
令人担忧的；令人不安的
If you describe something as unsettling, you mean that it makes you feel rather worried or uncertain.