2 sentences

1. 他反应迟钝，总是跟不上大家的思路。

   tā fǎn​yìng chí​dùn, zǒng​shì gēn​bu​shàng dà​jiā de sī​lù.

   He is slow-witted and always fails to keep up with the group's thinking.

   Source: Dong Chinese Dictionary

2. 冬眠的动物在刚醒来时动作往往很迟钝。

   dōng​mián de dòng​wù zài gāng xǐng​lái shí dòng​zuò wǎng​wǎng hěn chí​dùn.

   Hibernating animals are often sluggish when they first wake up.

   Source: Dong Chinese Dictionary