2 sentences for 拘谨 (jū​jǐn — reserved)

1. 你别这么拘谨嘛。

   nǐ bié zhè​me jū​jǐn ma.

   Don't be so reserved.

   Source: OpenSubtitles

2. 他在陌生人面前显得有些拘谨。

   tā zài mò​shēng​rén miàn​qián xiǎn​de yǒu​xiē jū​jǐn.

   He appears a bit reserved in front of strangers.

   Source: Dong Chinese Dictionary