Where does “fundamentally” come from?

Fundamentally derives from English fundamental, from Middle English -ly, from Latin fundamentum, formed from Latin fundus meaning "bottom" and the suffix -mentum.

fundamentally (English): In a fundamental or basic sense; reaching the...

Definitions

In a fundamental or basic sense; reaching the...

Ancestry of “fundamentally”, step by step

Step	Language	Word	Meaning
1	English	fundamental	A leading or primary principle, rule, law, or...
2	Latin	fundāmentālis	—
3	Latin	fundāmentum	—
4	Latin	fundō	—
5	Latin	fundus	bottom; farm; piece of land; estate; ground
6	Proto-Indo-European	bʰudʰmḗn	bottom
7	Proto-Indo-European	dʰewbʰ-	deep
8	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

Every word from Proto-Indo-European dʰewh₂- →

fundamentally — Etymology, Origin & Word History | Etymology Explorer