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.
例句
The country needs a strong intelligence service to counter espionage and foreign extremists...該國需要強大的情報機構來打擊間諜活動和外國極端分子。A previously unknown extremist group has said it carried out Friday's bomb attack.一個先前不為人知的極端組織聲稱實施了星期五的炸彈襲擊。
ADJ
極端主義的；過激的
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.