noun
acting alone in committing a crime; sole perpetrator
Legal term referring to a person who commits a crime by themselves, without accomplices. Used in criminal law contexts.
この事件は単独正犯によるものと判断された。
It was determined that this case was committed by a sole perpetrator.
共犯 refers to complicity or an accomplice, whereas 単独正犯 specifically means a sole perpetrator acting alone.
Compound of 単独 (alone, sole) and 正犯 (principal offender). A straightforward legal term.