28
revolutionary(noun, adjective, person, concern, enthusiastic)
21
extreme(adjective, concern, severe, enthusiastic, ill)
18
fanatic(noun, adjective, person, concern, interest)
17
extremist(noun, adjective, person, concern, belief)
16
essential(adjective, importance, important, significant, original)
16
insurgent(noun, adjective, person, rebel, revolutionary)
16
forward-thinking(tolerant, modern, liberal, progressive)
15
revolutionist(noun, person, concern, edge, politics)
15
ultra(noun, adjective, adverb, person, concern)
14
fundamental(adjective, important, significant, original, essential)
14
root(noun, adjective, cause, original, basic)
14
prime(importance, important, job, significant, original)
14
rebel(noun, adjective, person, original, liberal)
13
basic(adjective, base, important, significant, last)
13
nonconformist(noun, adjective, person, independent, eccentric)
13
fresh(adjective, new, feature, different, just)
12
original(noun, adjective, cause, important, new)
12
leftist(noun, adjective, person, excessive, liberal)
12
base(noun, last)
12
progressive(noun, adjective, person, open, moderate)
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APASmart Define. (2016). radical thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/radical/thesaurus/synonyms
ChicagoSmart Define. 2016. "radical thesaurus" https://smartdefine.org/radical/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, radical thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/radical/thesaurus/synonyms>.
MLASmart Define. "radical thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/radical/thesaurus/synonyms>