extremely evil or cruel
expressive of cruelty or befitting hell
e.g. something demonic in him--something that could be cruel
e.g. fires lit up a diabolic scene
e.g. diabolical sorcerers under the influence of devils
e.g. a fiendish despot
e.g. hellish torture
e.g. infernal instruments of war
e.g. satanic cruelty
e.g. unholy grimaces
Synonym: demonic diabolic fiendish hellish infernal satanic unholy