noun
secret; hidden matter
Rare literary term for a secret or concealed affair. Not used in everyday conversation; modern Japanese prefers 秘密 (ひみつ) or 内緒 (ないしょ).
古文書には、朝廷の隠事が記されている。
The ancient document records secrets of the imperial court.
Compound of 隠 (hidden) or 陰 (shadow/secret) and 事 (matter). The exact historical derivation is uncertain; it is a rare Sino-Japanese word.