This is the 1592nd most frequent Chinese word.
慎
Caution; carefulness; prudence.
The word '慎' is used here to mean 'cautious' or 'careful', emphasizing the careful attitude of the subject towards their work.
他对待工作非常谨慎。
He is very cautious in handling his work.
Here, '慎' conveys the need for prudence and careful consideration, applied to the context of selecting friends.
选择朋友时需谨慎。
You should be careful when choosing friends.
In this sentence, '慎' describes a quality of being prudent or consciously careful, attributing this characteristic to her general approach to life.