disloyal
/dɪsˈlɔɪəl/ 37Someone who is disloyal to their friends, family, or country does not support them or does things that could harm them. 不忠诚的
adjective [原级]不忠的;不忠诚的;背叛的
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。
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