They need to immunise teams against group-think: Hackman argued that the best ones contain"deviants" who are willing to do something that may be upsetting to others.
2017年6月四級真題（第三套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
ADJ-GRADED
心煩的；苦惱的；沮喪的
If you are upset, you are unhappy or disappointed because something unpleasant has happened to you.