15
radical(noun, adjective, person, concern, belief)
15
zealot(noun, person, right, concern, belief)
14
fanatic(noun, adjective, person, concern, interest)
12
revolutionary(noun, adjective, person, concern, belief)
11
ultra(noun, adjective, person, concern, belief)
10
extreme(adjective, concern, enthusiastic, ill, sick)
8
immoderate(noun, adjective, extreme)
7
revolutionist(noun, person, concern, belief, edge)
6
rabid(adjective, concern, violent, ill, extreme)
6
agitator(noun, belief, radical, rebel, progressive)
6
militant(noun, adjective, radical, thorough, rebel)
6
ultraist(noun, adjective, belief, enthusiastic, ill)
5
bigot(noun, person, radical, conservative, partisan)
5
excessive(adjective, extreme)
5
fanatical(adjective, concern, enthusiastic, ill, extreme)
5
sectarian(noun, person, radical, fanatic, partisan)
4
die-hard(noun, adjective, belief, uncompromising, holder of extreme views)
4
enthusiast(noun, radical, fanatic, intolerant, freak)
4
maverick(noun, person, radical, rebel, eccentric)
4
reformer(noun, rebel, fanatic, progressive, revolutionary)
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APASmart Define. (2015). extremist thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/extremist/thesaurus/synonyms
ChicagoSmart Define. 2015. "extremist thesaurus" https://smartdefine.org/extremist/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, extremist thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/extremist/thesaurus/synonyms>.
MLASmart Define. "extremist thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/extremist/thesaurus/synonyms>