〔こっそりと〕in secret, secretly;〔内輪で〕privately
- 内々の話ですが困ったことになりました
- Just between you and me, the situation looks very bad.
- 彼らは内々で月に1回会っている
- They meet secretly [in secret] once a month.
- 内々でお話したいのですが
- I'd like to have a private talk with you.
- このことは内々にしておいてください
- Please keep this to yourself.
- 内々彼に当たってみた
- I approached him informally [unofficially].
- そんなことになるのではないかと内々危ぶんでいた
- At heart I was afraid that might happen.