ABILITY [U]
B2 a feeling of being certain of your ability to do things well:
He's a good student, but he lacks confidence.
[+ to do sth] His training has given him the confidence to deal with any problem that arises.
TRUST [U]
› trust in someone's ability or a belief that something will produce good results:
Kate's new to the job, but I have every confidence in her.
SECRET [C]
› something secret that you tell someone:
to exchange confidences
in confidence
› If you tell something to someone in confidence, you do not want them to tell anyone else.