秘密

Noun

 * 1) secret

Adjective

 * 1) secret

Descendants
Others:

Adjective

 * 1) secret

Noun

 * 1) secret
 * 2) * 1905, 夏目漱石, 吾輩は猫である:
 * 1) * 1905, 夏目漱石, 吾輩は猫である:

Usage notes
More formal than, though both can be used in casual setting.