a.

1. 沉默的；寡言的；不作声的
   He was silent for a moment.

   他沉默了一会儿。

2. 寂静无声的
   The old house was quite silent.

   这所老房子寂静无声。

3. 未说出的，未言明的[Z][B]
4. 未（作）记述的；未（被）提及的[Z][F][（+on）]
   The law is silent on this point.

   在这一点上法律无明文规定。

5. 静止的，不活动的
6. 【语】不发音的[Z]
7. （电影）无声的[Z][B]
8. 【医】无症状的[Z][B]

n.

1. 无声电影[P]

adj.

1. not making or accompanied by any sound.
   ▸(of a film) without an accompanying soundtrack.
2. not speaking or not spoken aloud.
   ▸not prone to speak much.
3. (of a letter) written but not pronounced, e.g. b in doubt.
4. saying or recording nothing on a particular subject.