na-adjective, noun which may take the genitive case particle 'no'
Describes actions, operations, or arrangements done in secrecy, often with a nuance of careful concealment. Used as a na-adjective or no-adjective.
彼らは隠密に計画を進めた。
They proceeded with the plan in secret.
隠密な調査が行われている。
A covert investigation is being conducted.
noun
spy; secret agent (historical)
Historical term for a spy or undercover agent serving a daimyo or shogun in feudal Japan. Not used for modern spies.
江戸時代、隠密は諸大名の動きを探った。
In the Edo period, spies investigated the activities of various daimyo.