1
inordinate
1
insane(adjective, enthusiastic, ill, sick, fervent)
1
insubordinate
1
insurrecto
1
intemperate(adjective, enthusiastic, ill, sick, fervent)
1
intolerant(noun, adjective, enthusiastic, ill, sick)
1
intransigent
1
keen(adjective, enthusiastic, ill, sick, fervent)
1
left-wing extremist
1
left-winger(noun, rebel, fanatic, progressive, revolutionary)
1
leftist(noun, adjective, thorough, rebel, uncompromising)
1
lunatic fringe
1
mad(adjective, enthusiastic, ill, sick, fervent)
1
mad-dog(adjective, enthusiastic, ill, sick, fervent)
1
malcontent
1
mild radical
1
mildly radical
1
monomaniac(noun, radical, fanatic, intolerant, freak)
1
narrow-minded(adjective, enthusiastic, ill, sick, fervent)
1
new
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APASmart Define. (2015). extremist thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/extremist/thesaurus/synonyms
ChicagoSmart Define. 2015. "extremist thesaurus" https://smartdefine.org/extremist/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, extremist thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/extremist/thesaurus/synonyms>.
MLASmart Define. "extremist thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/extremist/thesaurus/synonyms>