Secret
Private
noun, な adjective
Something that has secrecy is secret and private.
Think about that really secret and private dude. He so (ひそ) secret...
僕たちは、お互いの家族にも知らせず、密かに入籍をしたんだ。
We entered the family registry in secret, without even letting the whole family know.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.