"Fundamentally" is a word in ENGLISH

Primarily, this word expresses the relations of presence, nearness in place or time, or direction toward; as, at the ninth …

That from which anything primarily proceeds; the fountain; the spring; the cause; the occasion.

In the original time, or in an original manner; primarily; from the beginning or origin; not by derivation, or imitation.

In a primary manner; in the first place; in the first place; in the first intention; originally.