mephistophelian
Meph`is*to*phe"li*an ( or ), a. Defn: Pertaining to, or resembling, the devil Mephistopheles, "a crafty, scoffing, relentless fiend;" devilish; crafty.
Meph`is*to*phe"li*an ( or ), a. Defn: Pertaining to, or resembling, the devil Mephistopheles, "a crafty, scoffing, relentless fiend;" devilish; crafty.