A devilish and cunning plan to take over the world is an example of a diabolical plan.
- Of, concerning, or characteristic of the devil; satanic.
- Appropriate to a devil, especially in degree of wickedness or cruelty.
Origin of diabolicalFrom Middle English deabolik from Old French diabolique from Late Latin diabolicus from Latin diabolus devil ; see devil .
(comparative more diabolical, superlative most diabolical)
First attested between 1350 and 1400 from Middle English diabolik, from Middle French diabolique, from Late Latin diabolicus, from Ancient Greek Î´Î¹Î±Î²Î¿Î»-Î¹ÎºÏŒÏ‚ (diabolikos, “devilish"), from Î´Î¹Î¬Î²Î¿Î»Î¿Ï‚ (diabolos).