radical - English Synonyms Dictionary

radical

n.
[1] group , chemical group
[2] free radical
[3] extremist , revolutionary , fanatic , zealot , immoderate , anarchist , militant
[4] communist , leftist , left-winger , red , Bolshevik , Bolshevist , pink , (Slang) (US) pinko
[5] root , root word , base , stem , theme
adj.
[1] basic , fundamental , elementary , inherent , constitutional , elemental , essential , cardinal , principal , primary , deep , deep-seated , profound , underlying , organic , natural , rudimentary
[2] thorough , thoroughgoing , complete , entire , total , exhaustive , sweeping , (all-)inclusive , comprehensive , all-embracing , out-and-out , drastic , severe , extreme , extremist , revolutionary
[3] extremist , revolutionary , fanatic(al) , militant , anarchist(ic) , immoderate
[4] extremist , ultra
[5] revolutionary
[6] basal