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dis·loy·al / disˈloiəl/ • adj. failing to be loyal to a person, country, or body to which one has obligations: she felt that inquiring into her father's past would be disloyal to her mother. ∎  (of an action, speech, or thought) demonstrating a lack of loyalty: disloyal mutterings about his leadership.DERIVATIVES: dis·loy·al·ly adv.dis·loy·al·ty / -tē/ n.