fun ‧ da ‧ men ‧ tal ‧ ly AC /ˌfʌndəˈment ə li/ BrE AmE adverb
[ Word Family: noun : ↑ fundamentals ; adverb : ↑ fundamentally ; adjective : fundmental]
in every way that is important or basic:
The conclusions of the report are fundamentally wrong.
The political culture of the US is fundamentally different.