Synonyms:
demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy
Meaning: extremely evil or cruel; expressive of cruelty or befitting hell; "something demonic in him--something that could be cruel"; "fires lit up a diabolic scene"; "diabolical sorcerers under the influence of devils"; "a fiendish despot"; "hellish torture"; "infernal instruments of war"; "satanic cruelty"; "unholy grimaces"
Usage examples
Or, are the priests on such friendly terms with his satanic majesty that they lend him their keys?
His satanic eyes were the same, his hair was worse tangled, but his clothes had been made by a tailor.
What was worse, either by magic, by Satanic agency, or by sleight of hand, they managed to empty people's purses whilst talking to them....
A kind of dark pallor lent him a ghostly appearance in the uncertain light, an effect heightened by the satanic darkness of his lowering brows.
I've worked as His Satanic Majesty undoubtedly does when he receives word that a fresh batch of Mormons has hit the trail for the good-intentions pavement.