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extremist

noun [C]
 
 
/ɪkˈstriː.mɪst/

Definition

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
extremist tendenciesUnsuitable and unacceptable
(Definition of extremist noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of extremist