自信的英语单词是confident，名词形式是confidence。

confidentadj.确信的，深信的; 有信心的，沉着的; 自信的;n.知己; 心腹朋友;比较级：more confident 最高级：most confident复数：confidents [例句]I am confident that everything will come out right in time我坚信一切终究都会好起来。In time he became more confident and relaxed 。过了一段时间，他变得更加自信、更为放松。I am confident in him. 我对他有信心。I think people feel a bit more confident 我想人们应该觉得稍微自信了一点儿。I admired him for being so confident at his age. 我钦佩他这般年纪就如此自信。