adjective

radical

radical, fundamental

They proposed a radical change to the system.

They proposed a radical change to the system.

He has some radical political views.

He has some radical political views.

He was known as a political radical.

He was known as a political radical.

a ((radical)) change/idea describing a noun The new policy is a radical departure.

Synonyms: extreme, fundamental; Antonyms: moderate, conservative

From Latin 'radix' (root). A radical change goes to the 'root' of the problem.

Think of a plant's 'root' (Latin: radix). A 'radical' idea gets to the root of an issue.

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