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English definition of “un-American”

un-American

adjective uk   /ˌʌn.əˈmer.ɪ.kən/ US disapproving us  
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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