A self-confident person is sure they can do things well, and fairly sure that people will like them, or at least that they will be all right in the room. It is the adjective that matches self-confidence. About a person, confident and self-confident often do the same job.

A self-confident personself-confident的人 is sure they can do things well確信自己能把事情做好, and fairly sure that people will like them也相當確信別人會喜歡他們, or at least that they will be all right in the room或至少在場合裡不會出糗。It is the adjective that matches self-confidence這是self-confidence（自信）對應的形容詞。About a person講一個人的時候, confident and self-confident often do the same jobconfident和self-confident常常作用一樣。

Though actually, they are not always interchangeable. You can make a confident prediction (you are sure about the prediction). You cannot make a self-confident prediction — that sounds as if the prediction is pleased with itself.

Though actually不過其實, they are not always interchangeable這兩個字不是完全可以互換。You can make a confident prediction你可以說make a confident prediction（做一個有把握的預測） (you are sure about the prediction意思是你對這個預測很有把握)。You cannot make a self-confident prediction你不能說make a self-confident prediction — that sounds as if the prediction is pleased with itself因為那聽起來像是這個預測自己很得意。

Self-confident points at a person, or at the way a person walks, talks, or tries. People usually mean it as praise.

Self-confidentself-confident指向的是人 points at a person, or at the way a person walks, talks, or tries或是一個人走路、說話、嘗試事情的樣子。People usually mean it as praise人們通常是把它當成稱讚在講。

Said with a certain look, though, it can hint that someone is a bit too sure. The sentence around it tells you which.

Said with a certain look, though不過如果配上某種表情說出來, it can hint that someone is a bit too sure這可能暗示這個人有點太過自信。The sentence around it tells you which前後文會告訴你到底是哪種意思。