Usage Note
Confidencial is invariable in gender (same form for masculine and feminine), agreeing only in number: confidenciales. It appears frequently in bureaucratic and legal contexts — información confidencial, carácter confidencial. The related noun is confidencia ('a confidence/secret shared'), which is closer to the English 'confidence' in its personal sense than the broader confianza ('trust').
Examples
"Este documento es estrictamente confidencial."
Natural Translation
This document is strictly confidential.

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