This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Alternative capitalization of Mephistophelean

adj. Pertaining to, or resembling, the devil Mephistopheles, “a crafty, scoffing, relentless fiend;” devilish in character or aspect; crafty; showing cunning or ingenuity or wickedness.

Same as Mephistophelian.

adj. showing the cunning or ingenuity or wickedness typical of a devil

"Summerland by Michael Chabon, published in 2002, is a doorstop children's fantasy that combines baseball, dirigibles, interdimensional travel, changelings, and a mephistophelean trickster legend into a big stew (which could have been simmered down a bit more)."

evil    mephistophelian