Adjective mephistophelian has 1 sense
  1. devilish, diabolic, diabolical, mephistophelian, mephistophelean - showing the cunning or ingenuity or wickedness typical of a devil; "devilish schemes"; "the cold calculation and diabolic art of some statesmen"; "the diabolical expression on his face"; "a mephistophelian glint in his eye"
    Antonym: good (indirect, via evil)
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