We found one dictionary that defines the word mephistopheleanly:

General (1 matching dictionary)

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