extremist ( extremists plural )
1 n-count 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., (disapproval)
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.
2 adj 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.
usu ADJ n (disapproval)
Translation English Cobuild Collins Dictionary
die-hard, fanatic, radical, ultra, zealot
English Collins Dictionary - English synonyms & Thesaurus
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