What does "radically" mean?

In a radical manner; fundamentally; very.

Radically

Common synonyms include: a outrance, absolutely, all out, beyond all bounds, beyond compare, beyond comparison.

/ˈɹædɪkli/ adv

adv ·Uncommon ·College level

Adverb

1
In a radical manner; fundamentally; very.
"two radically different political groups"
2
At the root.
""Clot" and "clod" are radically the same word."

Adverb

"His idea will radically alter our way of life."

From radical + -ly or radix (“root”) + -ally.