Not even family secrets and communications of the most confidential nature were respected.

It adds that its database "does not contain information of a confidential nature."

She leaned closer to emphasize the confidential nature of her theory.

But as he hadn't asked, and since nothing of a confidential nature was being discussed yet, I let it slide.

"Of course you realize the confidential nature of this matter?"

I'd like to stress again the confidential nature of my being here.

"You can't expect me to pass on to you information of a confidential nature."

It is of the most confidential nature, and belongs to me alone.

A few Jake was not able to answer because of their confidential nature.

I can't say anything of a confidential nature any longer.