late 14c., deabolik, "pertaining to the Devil; outrageously wicked, infernal," from Old French diabolique (13c.), from Late Latin diabolicus, from Ecclesiastical Greek diabolikos "devilish," from diabolos "the Devil, Satan" (see devil (n.)).
the cold calculation and diabolic art of some statesmen
fires lit up a diabolic scene
*dhwer-
di-
dia-
diabetes
diabetic
diabolic
diabolical
diabolism
diachronic
diacritic
diadem
