Definition of "arch-fiend" []

• A chief fiend; specifically, the devil. (noun)

The Century Dictionary (Public Domain)

• "A conspiracy organised not by a single scheming arch-fiend, but collectively by the British establishment – judges, lawyers, politicians, police chiefs, secret services, even newspaper editors – all of whom have been appointed to their positions because they are "a safe pair of hands"."
• "So was Constantine, the arch-fiend, the devil's right hand."
• "All, save I, were at rest or in enjoyment: I, like the arch-fiend, bore a hell within me; and, finding myself unsympathised with, wished to tear up the trees, spread havoc and destruction around me, and then to have sat down and enjoyed the ruin."