na-adjective, noun which may take the genitive case particle 'no'
Formal/literary adjective used to describe deep respect, gratitude, consideration, or reflection. Often appears in set phrases like 深甚なる感謝 (profound gratitude) or 深甚の意を表する (express one's deep respect).
深甚なる感謝の意を表します。
I express my profound gratitude.
We examined it with the utmost care.
profound; deep; careful
Compound of 深 (deep) and 甚 (extreme, very). The combination intensifies the meaning to convey profoundness or extreme depth, used in formal contexts.