Meaning

adjective having or marked by confidence or assurance

adjective persuaded of; very sure

adjective not liable to error in judgment or action; - Walter Lippman; - Michiko Kakutani

originFrom Middle French confident, from Latin confidens (“confident, i.e. self-confident, in a good or bad sense, bold, daring, audacious, impudent”), present participle of confidere (“to trust fully, confide”). See confide.

Etymology from Wiktionary, CC BY-SA 3.0