noun which may take the genitive case particle 'no', adverb, noun
private; confidential; internal; within a closed group
Used for matters kept within a family, company, or close circle; not for public disclosure. Often implies informality or off-the-record handling.
Please keep this matter confidential.
内々の集まりなので、気楽に来てください。
It's an informal gathering, so please feel free to come.
人事のことはまだ内々で進めている。
We're still handling the personnel matter internally.
The issue was handled quietly, within the group.
I had already consulted the manager privately, off the record.
It seems the personnel decision has already been made informally.
Please keep this strictly as a private matter between us.
Less common spelling without the repetition mark.