Lack of intent; random or arbitrary (without deliberate selection). Used often in statistics or legal contexts.
無作為抽出は調査で偏りを減らすために行われる。
Random sampling is conducted in surveys to reduce bias.
データは無作為に集められた。
The data were collected at random.
その事件は無作為な犯行とは考えにくい。
It is hard to believe that the incident was a random act.