Definify.com

Webster 1913 Edition

adv.

Primarily; originally; essentially; radically; at the foundation; in origin or constituents.

“Fundamentally defective.”

Burke.

Noun.

Primarily; originally; essentially; at the foundation. All power is fundamentally in the citizens of a state.

fundamentally ‎(comparative more fundamentally, superlative most fundamentally)

to the very core of the matter