a.

1. 祕密的；機密的
   confidential information

   機密情報

2. 表示信任的
   She spoke in a confidential tone of voice.

   她用信任的口吻說。

3. 獲信任的；參與機密的
   a confidential secretary

   機要祕書

adj.

1. intended to be kept secret.
2. entrusted with private information:
   a confidential secretary.