confident

Compared meaning: certain, having no doubt (adjective).

比较义项：确信的，有把握的（形容词）。

• sure

  A general everyday word for being certain of a fact, plan or future event; commonly follows 'I'm sure (that)...'; not limited to judging one's own ability, can be about anything or anyone.

  日常用语，表示对某个事实、计划或未来的事情很确定；常用于“I'm sure (that)…”句型；不局限于评价自己的能力，也可以指任何事或任何人。

  I'm sure I locked the front door before we left.

  我确定我们出门前锁了前门。

• confident 本词

  Focuses on self-assurance, especially about one's own ability or future performance; commonly paired with 'confident of/about doing something'; carries a positive, encouraging tone.

  侧重对自己的能力或未来表现有信心；常与“confident of/about doing something”搭配；语气积极、令人振奋。

  She's confident she'll get the promotion this year.

  她对自己今年会获得晋升很有信心。

Sure and confident both mean certain, but sure is neutral and everyday, used for facts, plans, or events. Confident focuses on believing in your own ability or future performance, and sounds more positive. Sure alone as a casual reply, like 'Sure!', is not compared.

sure 和 confident 在这个意义上很接近，都表示“确信、有把握”，但 sure 只是单纯表示对事实或情况的确定，语气中性、日常；confident 则强调对自身能力或表现的信心，语气更积极，常用于谈论能力和前景。这里不比较 sure 用作口语应答“好的，当然”（如“Sure!”）的用法。