confident

Etymology

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

adj

1. Very sure of something; positive.
   I'm pretty confident that she's not lying, she's acting normally.
   He was confident of success.
2. Self-assured, self-reliant, sure of oneself.
3. (obsolete, in negative sense) Forward, impudent.
   I was rated as the most confident ruffian, for daring to approach her room at that hour of night. 1775, Richard Brinsley Sheridan, The Duenna, I.2

noun

1. Obsolete form of confidant.
   He managed this consultation with exceeding secrecy, admitting only four or five of his confidents, on whom he most relied