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Synonyms of radical in English:

radical


See definition of radical

adjective

1‘radical reform is long overdue’

SYNONYMS
thoroughgoing, thorough, complete, total, entire, absolute, utter, comprehensive, exhaustive, root-and-branch, sweeping, far-reaching, wide-ranging, extensive, profound, drastic, severe, serious, major, desperate, stringent, violent, forceful, rigorous, draconian
ANTONYMS

superficial

2‘the apparently radical differences between logic and natural language’

SYNONYMS
fundamental, basic, essential, quintessential
inherent, innate, structural, deep-seated, intrinsic, organic, constitutive, root
ANTONYMS

minor

3‘a radical political movement’

SYNONYMS
revolutionary, progressive, reforming, reformist, revisionist, progressivist
leftist, left-wing, ultra-left, socialist, anti-capitalist
extreme, extremist, fanatical, militant, diehard
informal red
British informal swivel-eyed
derogatory Bolshevik
ANTONYMS

conservative, reactionary, moderate


noun

1‘he was by no means a radical’

SYNONYMS
revolutionary, progressive, reformer, revisionist
leftist, left-winger, socialist
militant, zealot, extremist, fanatic, diehard
informal ultra, red
derogatory Bolshevik, Bolshevist
ANTONYMS

conservative, reactionary, moderate