radical

Synonyms: basal bottom cardinal constitutional deep-seated essential foundational inherent innate intrinsic meatand-potatoes native natural organic original primal primary primitive profound thoroughgoing underlying vital

Antonyms: extrinsic nonessential superficial

Synonyms: advanced anarchistic complete entire excessive extremist fanatical far-out freethinking iconoclastic immoderate insubordinate insurgent insurrectionary intransigent lawless leftist militant mutinous nihilistic progressive rabid rebellious recalcitrant recusant refractory restive revolutionary riotous seditious severe sweeping thorough ultra ultraist uncompromising violent way out

Antonyms: conservative moderate

Synonyms: agitator anarchist avantgarde extremist fanatic firebrand freethinker iconoclast insurgent insurrectionist leftist left-winger militant mutineer nihilist nonconformist objector pacifist progressive rebel reformer renegade revolter revolutionary rioter secessionist subversive ultraist

Antonyms: conservative moderate