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月六級真題（第三套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
ADJ-GRADED
令人擔憂的；令人不安的
If you describe something as unsettling, you mean that it makes you feel rather worried or uncertain.