1 radical /ˈrædɪkəl/ adjective
1 radical
Learner's definition of RADICAL
[more radical; most radical]
: very new and different from what is traditional or ordinary
: very basic and important
: having extreme political or social views that are not shared by most people
US slang, somewhat old-fashioned : very appealing or good

— radically

/ˈrædɪkli/ adverb

— radicalness

noun [noncount]
2 radical /ˈrædɪkəl/ noun
plural radicals
2 radical
plural radicals
Learner's definition of RADICAL
: a person who favors extreme changes in government : a person who has radical political opinions