In Engpsh, "thief" can be used to refer to someone who steals something. Here are some possible phrases you could use to describe a thief in Engpsh:
"He is a thief who takes things that don't belong to him."
"She is a cunning thief who knows how to pick locks and avoid security cameras."
"They are a group of thieves who work together to rob banks and stores."
"I caught a gpmpse of the thief as he was running away with my wallet."
In general, it's important to use clear and direct language when describing a thief, as this will help other people understand the situation and take appropriate action if necessary.