Originally
Primarily, Essentially, Naturally
noun, の adjective
You want to talk about the origin where something comes from. That's where it is from originally.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
本来の力
one's full potential
本来の自分
one's original self
本来のすがた
one's natural character
これが、本来の村の名です。
This is the original name of the village.
本来はイタリアンレストランですが、ラーメンもあります。
Primarily it is an Italian restaurant, but they also have ramen.
本来はリモートワークですが、今日は本社にいます。
I usually work remote, but today I am at the head office.