IPA: /ˌʌndərˈlaɪɪŋli/
KK: /ʌndərˈlaɪɪŋli/
In a manner that is fundamental or basic to something, often not immediately obvious.
The issues underlyingly affect the community's well-being.
Underlyingly → It is formed from "under-" (meaning beneath or below) and "lying" (from the verb "lie", meaning to rest or be situated). The suffix "-ly" (meaning in a manner of) indicates the manner in which something is situated beneath. Thus, "underlyingly" refers to something that is situated beneath the surface or foundationally in a manner.
Think of something that is 'beneath' ('under-') and 'situated' ('lying') — this helps you remember that 'underlyingly' means in a manner that is foundational or beneath the surface.