radical

US /ˈræd.ɪ.kəl/
UK /ˈræd.ɪ.kəl/
"radical" picture
1.

relating to or affecting the fundamental nature of something; far-reaching or thorough.

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The company underwent a radical transformation.
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He proposed a radical solution to the problem.
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fundamentalbasicessentialthoroughfar-reachingdrasticextremesweepingprofoundcomplete
2.

(of a person or group) advocating or based on thorough or extreme political or social change; representing an extreme section of a political party.

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The party's radical wing pushed for immediate reforms.
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She is known for her radical views on education.
:
extremedrasticrevolutionarymilitantextremistreformistprogressiveleft-wingfar-left
1.

a person who advocates thorough or extreme political or social change; a member of a political party or group representing an extreme wing.

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The young radical joined the protest movement.
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He was considered a radical in his time.
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extremistrevolutionarymilitantreformeractivist
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radicallyradicalize