Origin of Diabolical
First attested between 1350 and 1400 from Middle English diabolik, from Middle French diabolique, from Late Latin diabolicus, from Ancient Greek διαβολ-ικός (diabolikos, “devilish"), from διάβολος (diabolos).
From Middle English deabolik from Old French diabolique from Late Latin diabolicus from Latin diabolus devil devil
From American Heritage Dictionary of the English Language, 5th Edition
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