Profound
Deep
い adjective
If your interior is deep, then you're a really profound person.
The readings for this word are both kun'yomi readings. You learned おく when you learned the kanji, and ふかい from 深い, so you should be able to read this on your own. Most of the time the ふ is rendaku'd into ぶ, but it can be read the other way too.
狩人とは非常に奥深い職業です。
A hunter is a very profound occupation.