confidential

confidentia (Latin)

Assurance, confidence. Boldness, impudence, audacity.

-al (English)

(organic chemistry) Forms the names of aldehydes. Forming nouns, especially of verbal action.. Of or pertaining to. Adjectival suffix appended to various words, often nouns, to make an adjective form. Often added to words of Latin origin, but used with other words also.

confidential (English)

(dated) Inclined to share confidences.. Kept, or meant to be kept, secret within a certain circle of persons; not intended to be known publicly.