confident (adj.)youdaoicibaDictYouDict[confident 词源字典]
1570s, "self-reliant, sure of oneself," from Middle French confident, from Latin confidentem (nominative confidens) "firmly trusting, reliant, self-confident, bold, daring," present participle of confidere (see confidence). Related: Confidently.[confident etymology, confident origin, 英语词源]