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1.
1. Ruthlessly intelligent and cunning.

2. Cruel or evil.

Derived from Mephistophiles, the Devil figure in the German Faust legend.
The bank robbers planned the job with mephistophelean care.

He examined the wounded man with a mephistophelean gleam in his eye.
by boiled_elephant February 24, 2008

Words related to Mephistophelean

calculating cruel evil faust mephisto mephistophiles