But I'm not so confident anymore that it's the wrong thing to say.

但我不能再肯定那是错误的。

耶鲁公开课 - 死亡课程节选

So my walk is, it's not confident and I'm not sure if I'm strong in my step yet.

所以我的走姿不是特别自信，担心步伐会不稳。

I wonder if 实战 - SpeakingMax英语口语达人

First of all, I'm very pleased when this happens, because I'm pretty confident that I can do this under duress, but I may not do it right every time.

首先,我非常乐意你们指出我的错误,因为虽然我对这些公式了如指掌,但我并不能保证每次都写对

耶鲁公开课 - 基础物理课程节选

Mr. RICK KRUEGER (Biologist): Well, I'm not sure I'm confident that can happen.

NPR: Drilling to Begin in Colorado Ferret Habitat

But I'm not confident they'll respond to this need in proper fashion.

FORBES: Magazine Article

"After leaving last night, I'm not so confident now we'll see much, if anything, " he said.

NPR: Boston Marathon Fund Chief: Lower Expectations