2 sentences

1. 他坐在角落里，一言不发。

   tā zuò zài jiǎo​luò lǐ, yī​yán​bù​fā.

   He sat in the corner, not saying a word.

   Source: Dong Chinese Dictionary

2. 他绷着脸，一言不发。

   tā běng zhe liǎn, yī​yán​bù​fā.

   He had a stern expression and didn't say a word.

   Source: Dong Chinese Dictionary