also: おくぶかい
i-adjective
Used for abstract depth: profound meaning, deep knowledge, or complex insight.
彼の言葉はとても奥深い。
His words are very profound.
この本は奥深い内容で、何度
This book has deep content that makes you want to reread it many times.
i-adjective
deep (of a cave, etc.); innermost; interior
Describes physical depth extending far inward, such as a deep cave, forest, or building interior.
その洞窟は奥深くまで続いていた。
The cave extended deep inside.
森の奥深い場所で珍しいキノコを見つけた。
I found a rare mushroom deep in the forest.