n. 25B6; adjective
radical reform : THOROUGHGOING, thorough, complete, total, comprehensive, exhaustive, sweeping, far-reaching, wide-ranging, extensive, profound, major, stringent, rigorous.
radical differences between the two theories : FUNDAMENTAL, basic, essential, quintessential; structural, deep-seated, intrinsic, organic, constitutive.
a radical political movement : REVOLUTIONARY, progressive, reformist, revisionist, progressivist; extreme, extremist, fanatical, militant, diehard.
superficial, minor, conservative.
25B6; noun the arrested man was a radical : REVOLUTIONARY, progressive, reformer, revisionist; militant, zealot, extremist, fanatic, diehard; informal ultra.
conservative.