disapproval If you describe someone as an extremist, you disapprove of them because they try to bring about political change by using violent or extreme methods. The country needs a strong intelligence service to counter espionage and foreign extremists A previously unknown extremist group has said it carried out Friday's bomb attack. a marked rise in extremist violence
disapproval If you say that someone has extremist views, you disapprove of them because they believe in bringing about change by using violent or extreme methods. someone who has extreme political opinions and aims, and who is willing to do unusual or illegal things in order to achieve them
a person who holds extreme views (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative