A completely overconfident person (the silent kung fu master in movies) can be just as silent as an extremely under-confident one.

超级自信的人（比方说电影里少言寡语的功夫大师）也有可以跟完全不自信的人一样安静。

youdao

This time the jailer might not be as silent as usual, but speak to dantes, and seeing that he received no reply, go to the bed, and thus discover all.

这次，狱卒或许不会象往常那样沉默，他或许会同唐太斯讲话，而当看到他不回答时，或许会走到床边去看看，这样可就全露馅了。

youdao

As the curtain rose, the audience fell silent.

幕启时，观众安静下来。

《牛津词典》

They saw Grant as a strong and silent soldier a great leader who had won a long and bitter war.

VOA: special.2010.02.11

And, it follows from him that political liberty means the freedom to act where the law is silent, as he says.

而他的政治自由意味着,我们可以在法律所认可的范畴内,享有充分的行动自由。

耶鲁公开课 - 政治哲学导论课程节选

Think of that, that where the law is silent, we have the freedom to do or not to do as we choose, very important to the way we think of liberty today in a modern and you might say liberal democracy.

仔细想想，在法律所认可的地方，我们可按自己的选择去做或是不做，这对身在现代自由民主时代的我们,思考何为自由至关重要。

耶鲁公开课 - 政治哲学导论课程节选

In fact, they tend to become too calm and exhibit minimal variability as silent risks accumulate beneath the surface.

FORBES: The Bailout Mentality -- The REAL "New Normal"

Poland's 400, 000-plus Germans are not quite as silent as they once were.

ECONOMIST: Poland

Some have no real effect, and are known as silent mutations.

ECONOMIST: Genetics gets more complicated