This is the 791st most frequent Vietnamese word.
kẻ
"Person" or "individual," often with a negative or neutral connotation like "fellow" or "one."
Here, 'kẻ' means 'the person', used to describe someone who performs an action (in this case, stealing).
Kẻ trộm đã lẻn vào nhà vào ban đêm.
The thief sneaked into the house at night.
In this sentence, 'kẻ' is used to mean 'the one who', referring to someone with a particular characteristic (adventurous).
Kẻ phiêu lưu thường tìm kiếm những thử thách mới.
Adventurers often seek new challenges.
Here, 'kẻ' stands for 'the individual', referring to someone with a specific role or relationship (enemy).