Source : Webster's Revised Unabridged Dictionary (1913)

Radically \Rad"i*cal*ly\, adv.
   1. In a radical manner; at, or from, the origin or root;
      fundamentally; as, a scheme or system radically wrong or
      defective.

   2. Without derivation; primitively; essentially. [R.]

            These great orbs thus radically bright. --Prior.

Source : WordNet®

radically
     adv : in a radical manner; "she took a radically different
           approach"