disloyal
/ˌdɪsˈlɔɪəl/adjective
1- failing to be loyal to a person, country, or body to which one has obligations（对人、国家或团体）不忠实的：
she felt that inquiring into her father's past would be disloyal to her mother.
她觉得打听她父亲的过去就是对她母亲的不忠。
1.1
- (of an action, speech, or thought) demonstrating a lack of loyalty（行动, 语言, 思想）不忠诚的：
disloyal mutterings about his leadership.
对他的领导能力的一些不忠的怨言。
派生词
disloyally
adverbdisloyalty
noun词源
late 15th cent.: from Old French desloial, from des- (expressing negation)+loial 'loyal'.