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English definition of “extremist”

extremist

noun [C] uk   /ɪkˈstriː.mɪst/ us  
C2 someone who has beliefs that most people think are unreasonable and unacceptable: a group of extremists (= people with extreme opinions)Unsuitable and unacceptable
extremist
adjective uk   us  
extremist tendenciesUnsuitable and unacceptable
(Definition of extremist from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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