diabolical
oxford
views updated May 11 2018di·a·bol·i·cal / ˌdīəˈbälikəl/ (also di·a·bol·ic) •
adj. belonging to or so evil as to recall the Devil: his diabolical cunning.DERIVATIVES: di·a·bol·i·cal·ly / -ik(ə)lē/ adv. I am going to get diabolically drunk.
The Oxford Pocket Dictionary of Current English