Eng

Secretly...

暗自

Implicitly, Quietly, Secretly, To oneself

暗中

In secret, Secretly

暗地裡

Secretly

偷偷

Secretly, Stealthily, Surreptitiously

私自

Personally, Privately, Secretly

祕密

Secret, Secretly, Surreptitiously

祕密地

Secretly, Surreptitiously

(Secret)

背地裡

Behind, In secret, Secretly