1A pickpocket — someone who secretly steals money or valuables from another person's pocket or bag without being noticed; also the act of pickpocketing. Common in crowded places like trains.
電車の中でスリに財布を盗まれた。
My wallet was stolen by a pickpocket on the train.
人混みではスリに気をつけたほうがいい。
You should watch out for pickpockets in crowds.
駅の防犯カメラがスリの犯行を捉えていた。
The station's security camera captured the pickpocket in the act.