3
anarchist
3
progressive
3
rebel(noun, adjective, radical, eccentric, progressive)
3
severe
2
activist(noun, radical, fanatic, freak, revolutionary)
2
bigoted(adjective, enthusiastic, ill, sick, fervent)
2
crusader(noun, radical, zealot, fundamentalist)
2
diehard(noun, adjective, person, conservative, fanatic)
2
dogmatist(noun, supporter, radical, fanatic, partisan)
2
fiend(noun, radical, fanatic, intolerant, freak)
2
insurgent
2
insurrectionary
2
insurrectionist
2
irrational(adjective, enthusiastic, ill, sick, fervent)
2
left-wing
2
maniac(noun, radical, fanatic, intolerant, freak)
2
meliorist
2
mutineer
2
nut(noun, radical, fanatic, freak, visionary)
2
pinko
11 years ago|7.4k views|share |citing 
APASmart Define. (2015). extremist thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/extremist/thesaurus/synonyms
ChicagoSmart Define. 2015. "extremist thesaurus" https://smartdefine.org/extremist/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, extremist thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/extremist/thesaurus/synonyms>.
MLASmart Define. "extremist thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/extremist/thesaurus/synonyms>