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

[ Syn: demonic , diabolic , diabolical , hellish , infernal , satanic , unholy ]