/ ˌmefɪstəˈfiːliən; NAmE also ˌmefɪˌstɑ:fəˈliən/ adjective
( formal ) very evil; like the Devil
ORIGIN: From Mephistopheles , an evil spirit to whom, according to the German legend, Faust sold his soul.
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WORD ORIGIN
mid 19th cent.: from Mephistopheles , an evil spirit to whom Faust, in the German legend, sold his soul.