disloyal /dɪsˈlɔɪəl/ TEM4

• 1. 

  ADJ Someone who is disloyal to their friends, family, or country does not support them or does things that could harm them. 不忠诚的

  例：

  She was so disloyal to her deputy she made his position untenable.

  她对她的副手如此不忠诚，以至于弄得他的职位岌岌可危。