Synonyms of 'radicalism'
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Extremism is the behaviour or beliefs of extremists.
an attempt to eliminate racism and right-wing extremism
Fanaticism is fanatical behaviour or the quality of being fanatical.
a protest against intolerance and religious fanaticism
Socialism is a set of left-wing political principles whose general aim is to create a system in which everyone has an equal opportunity to benefit from a country's wealth. Under socialism, the country's main industries are usually owned by the state.
the steady rise of socialism in this country
Thesaurus for radicalism from the Collins English Thesaurus
Radicalism is radical beliefs , ideas , or behaviour .