extremist
US /ɪkˈstriː.mɪst/
UK /ɪkˈstriː.mɪst/
1.
a person who holds extreme political or religious views, especially one who resorts to or advocates extreme action
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The government is trying to combat extremist groups.
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His views are considered too extremist for mainstream politics.
1.
holding or advocating extreme views or measures
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The group's extremist ideology led to violence.
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He was known for his extremist political views.