radically

/R AE1 D IH0 K L IY0/
adverb
  1. 1

    In a radical manner; fundamentally; very.

    โ€œtwo radically different political groupsโ€

  2. 2

    At the root.

    โ€œ"Clot" and "clod" are radically the same word.โ€

Source: https://en.wiktionary.org/wiki/radically