Etymology
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radically (adv.)

early 15c., radicali, "originally, from the roots or sources," from radical (adj.) + -ly (2). Sense of "thoroughly" is by c. 1600.

updated on March 30, 2021

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Definitions of radically from WordNet

radically (adv.)
in a radical manner;
she took a radically different approach
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.