8 letters · 13 points in Scrabble
adjective showing the cunning or ingenuity or wickedness typical of a devil
adjective extremely evil or cruel; expressive of cruelty or befitting hell
originFrom Middle English diabolik, from Middle French diabolique, from Late Latin diabolicus, from Ancient Greek διαβολικός (diabolikós, “devilish”), from διάβολος (diábolos, “devil”). First attested in 1350–1400.
Etymology from Wiktionary, CC BY-SA 3.0