We found one dictionary that defines the word Mephistopheleanly:

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1. Mephistopheleanly: Wiktionary

Definitions from Wiktionary (Mephistopheleanly) ▸ adverb:  In a Mephistophelean manner. ▸ Words similar to Mephistopheleanly ▸ Usage examples for Mephistopheleanly ▸ Idioms related to Mephistopheleanly ▸ Wikipedia articles (New!) ▸ Words that often appear near Mephistopheleanly ▸ Rhymes of Mephistopheleanly ▸ Invented words related to Mephistopheleanly