Another word for radical
Advocating extreme change
extremist, revolutionary, fanatical, militant, rabid, insurgent, iconoclastic, advanced, forward, insurrectionary, progressive, revisionist, abolitionist, leftist, communistic, left-wing, uncompromising, intransigent, recalcitrant, mutinous, rebellious, recusant, subversive, seditious, riotous, lawless, ultraconservative, racist, white supremacist, insubordinate, anarchistic, nihilistic, Bolshevistic, Communist, socialist, liberal, immoderate, heretical, freethinking, avant-garde, Jacobinic, ultraist, ultraistic, ultra, red*, pink*; see also fanatical, rebellious 2, revolutionary 1.
Antonyms conservative*, reformist, gradualist.
Another word for radicaladjective
Arising from or going to the root or source:basal, basic, foundational, fundamental, original, primary, underlying. See surface
Holding especially political views that deviate drastically and fundamentally from conventional or traditional beliefs:extreme, extremist, fanatic, fanatical, rabid, revolutionary, ultra. (Slang) far-out. See concern, edge, politics