radical
rad-i-cal
noun
A person advocating extreme political or social reform.
"The radicals demanded immediate action."
adjective
Relating to the fundamental nature; far-reaching or thorough.
"The government proposed radical changes."
adjective
Advocating extreme political or social reform.
"She holds radical political views."
Thesaurus
Synonyms: basic, free radical, revolutionary, new, basal, group, chemical group, base, theme, root word, stem, root
Antonyms: cauline