/ dɪsˈlɔɪəl; NAmE / adjective
disloyal (to sb/sth) not loyal or faithful to your friends, family, country, etc. :
He was accused of being disloyal to the government.
► dis·loy·alty / -ˈlɔɪəlti; NAmE / noun [ U ]
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WORD ORIGIN
late 15th cent.: from Old French desloial , from des- (expressing negation) + loial loyal.