Confidential
来自Big Physics
wiktionary
From Latin confidentia + -al.
etymonline
confidential (adj.)
1759, "indicating the confiding of a private intimacy," from Latin confidentia (see confidence) + -al (1). Sense of "intended to be treated as private" is from 1773; that of "enjoying the confidence of another" is from 1805. Related: Confidentially.
