5 sentences

1. 他愣了半晌才反应过来。

   tā lèng le bàn​shǎng cái fǎn​yìng guò​lái.

   He stared blankly for quite a while before he reacted.

   Source: Dong Chinese Dictionary

2. 他愣了一下，没有反应过来。

   tā lèng le yī​xià, méi​yǒu fǎn​yìng guò​lái.

   He was stunned for a moment and didn't react.

   Source: Dong Chinese Dictionary

3. 他先是愣了一下，继而大笑起来。

   tā xiān shì lèng le yī​xià, jì'ér dà​xiào qi​lai.

   He was stunned for a moment, then burst out laughing.

   Source: Dong Chinese Dictionary

4. 他愣是没听我的劝告。

   tā lèng shì méi tīng wǒ de quàn​gào.

   He simply wouldn't listen to my advice.

   Source: Dong Chinese Dictionary

5. 他这人太愣，说话不过脑子。

   tā zhèi rén tài lèng, shuō​huà bù guò nǎo​zi.

   He is too blunt and speaks without thinking.

   Source: Dong Chinese Dictionary