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thief
This term carries a strong criminal connotation and focuses on the act of taking something that does not belong to the actor. It is a broad label that encompasses everything from a petty pickpocket to a professional heist artist. While it describes the identity of the person, it implies a breach of trust or a violation of law. Compared to a robber, a thief is not necessarily using force or threats. The image associated with a thief is often one of stealth, secrecy, and evasion, whereas robbery implies a more direct and violent confrontation. It is used in both legal contexts and casual conversation to label someone by their illicit action.
Used to count individual people who commit theft, such as identifying two thieves in a security video.