11
primary(adjective, cause, base, importance, important)
10
drastic(adjective, severe, extreme)
10
organic(adjective, important, significant, original, essential)
10
severe(adjective, harsh, exceptional, extreme, demanding)
10
thorough(adjective, extremes)
9
advanced(adjective, open, moderate, spread, new)
9
basal(adjective, base, important, significant, last)
9
anarchist(noun, person, rebel, partisan, reactionary)
9
complete(adjective, extremes)
9
immoderate(noun, adjective, severe, harsh, violent)
9
liberal(noun, adjective, open, moderate, spread)
9
militant(noun, adjective, person, aggressive, thorough)
9
stem(noun, cause)
9
subversive(noun, adjective, person, revolutionary, secretive)
9
underlying(adjective, base, important, significant, last)
8
inherent(adjective, essential, basic, fundamental, key)
8
insurrectionist(noun, adjective, person, rebel)
8
rabid(adjective, concern, severe, harsh, violent)
8
sweeping(adjective, completeness, extremes)
7
capital(importance, job, essential, fundamental, key)
10 years ago|28k views|share |citing 
APASmart Define. (2016). radical thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/radical/thesaurus/synonyms
ChicagoSmart Define. 2016. "radical thesaurus" https://smartdefine.org/radical/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, radical thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/radical/thesaurus/synonyms>.
MLASmart Define. "radical thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/radical/thesaurus/synonyms>