Definition of Mephistophelian in English:

Mephistophelian

(also Mephistophelean)

Pronunciation /məˌfistəˈfēlēən/ /məˌfɪstəˈfiliən/

adjective

  • Wicked; fiendish.

    • ‘a Mephistophelian cackle’
    diabolical, fiendish, devilish, demonic, demoniac, demoniacal, Mephistophelian

Origin

Early 19th century from Mephistopheles, an evil spirit to whom Faust, in the German legend, sold his soul.