noun
lone criminal; sole perpetrator
Refers to a person who commits a crime alone, without accomplices. Used in legal and news contexts.
警察は単独犯の可能性が高いと見ている。
The police believe it is highly likely the work of a lone perpetrator.
noun
crime carried out by one person
Refers to the act or case of a crime committed by a single person, as opposed to a group or organized crime.
この事件は単独犯ではなく、組織的な犯行の疑いがある。
This case is suspected to be an organized crime, not a crime carried out by one person.