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un-American

adjective
 
/ˌʌn.əˈmer.ɪ.kən/ US disapproving

Definition

guilty of activities, behaviour, or beliefs that show opposition or no loyalty to the US and its political system: From 1940 to 1943, he was general counsel of the House committee investigating un-American activities.United States politics and governmentDisloyalty, betrayal and treason
(Definition of un-American adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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