2 sentences for 生疏 (shēng​shū)

1. 很久没写英文，笔头生疏了。

   hěn jiǔ méi xiě Yīng​wén, bǐ​tóu shēng​shū le.

   I haven't written in English for a long time, so my writing has become rusty.

   Source: Dong Chinese Dictionary

2. 我们多年没见，感到有些生疏。

   wǒ​men duō nián méi jiàn, gǎn​dào yǒu​xiē shēng​shū.

   We haven't seen each other for years and feel a bit distant.

   Source: Dong Chinese Dictionary