loner

On the face of it, he is perhaps more a middle-class loner, and his apparent normality suggests a crime triggered by internalised mental processes, rather than by peer-driven association or emulation.

Then suddenly out of nowhere appears this outsider, or sometimes this loner from within the community.

Iris is Stefani’s grandmother, who has turned into a paranoid loner living in a rural fortified compound only the Unabomber could love.

Both are loners who’d rather avoid the spotlight — particularly at parties.

Following the attacks, Sir Keir Starmer said Britain faced a new threat from "extreme violence carried out by loners, misfits, young men in their bedrooms".