IPA: /fərˈbɪdɪŋli/
KK: /fərˈbɪdɪŋli/
In a way that makes something seem unwelcoming or threatening.
The dark clouds loomed forbiddingly over the town, signaling a storm.
Forbiddingly → It is formed from "forbid" (from Old English "forbiddan", meaning to prohibit or refuse) and the suffix "-ingly" (meaning in a manner that). The word "forbiddingly" describes an action done in a manner that prohibits or refuses something.
Think of the word 'forbid' which means to prohibit, and remember that 'forbiddingly' describes doing something in a way that refuses or prohibits.