also: じんじん
noun
extremely deep; profound
Rare literary word used for profound depth, often in philosophical or religious contexts. Not used in everyday conversation.
彼の言葉には甚深な意味が込められていた。
His words carried an extremely profound meaning.
深遠 is a more common literary word for profound depth, while 甚深 is rarer and emphasizes extreme depth.
Compound of 甚 (extreme) and 深 (deep). The exact historical derivation is uncertain; it is a rare literary term.