n.

1. 自信，信心，把握[U][（+in）][+to-v][+that]
   He lacks confidence in himself.

   他缺少自信。

2. 信赖，信任[U][（+in）]
   We have confidence in the mayor.

   我们信任这位市长。

3. （向知心人吐露的）秘密，私房话[C]
4. 大胆；过于自信；狂妄[U]

n.

1. the belief that one can have faith in or rely on someone or something.
   ▸a positive feeling arising from an appreciation of one's own abilities; self-assurance.
2. the telling of private matters or secrets with mutual trust.
   ▸a secret or private matter told to someone under a condition of trust.