confidential

adj. /ˌkɑːnfɪˈdenʃl/ B2

机密的；保密的

Meant to be kept secret and not shared with others.

仙境例句

The Rabbit's letter to the Duchess was confidential, so he read it aloud in a whisper.

白兔写给公爵夫人的信是机密的，所以他小声地念了出来。