disloyal
adjective uk/ˌdɪsˈlɔɪ.əl/ us/ˌdɪsˈlɔɪ.əl/
C2 不忠诚的，背叛的
not supporting someone that you should support
His sisters thought that his autobiography was disloyal to the family. 他的姐姐们认为他的自传是对家人的背叛。
Opposite: loyal
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