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

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Of, pertaining to, or resembling in character the spirit Mephistopheles; diabolical; sardonic; jeering; irreverent.

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

"Thanks to Fish Griwkowsky for this video clip, which features an MSNBC commentator denouncing the mephistophelian Ann Coulter in stunningly strong terms."

evil