1. the feeling or belief that one can rely on someone or something; firm trust.
“we had every confidence in the staff”
synonyms: trust, belief, faith, credence, conviction
“I have little confidence in these figures”
antonyms: skepticism, distrust the state of feeling certain about the truth of something.
“it is not possible to say with confidence how much of the increase in sea levels is due to melting glaciers”
a feeling of self-assurance arising from one’s appreciation of one’s own abilities or qualities.
synonyms: self-assurance, self-confidence, self-possession, assertiveness; poise, aplomb, phlegm; courage, boldness, mettle, nerve
“she’s brimming with confidence”
antonyms: uncertainty, doubt
the telling of private matters or secrets with mutual trust.
late Middle English: from Latin confidentia, from confidere ‘have full trust’ (see confident).
When someone says that you need to have self-esteem and confidence, I have always gotten annoyed with this. Because it is my belief that the definition is often misunderstood. I know that I used to confuse the definition as well.