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"
Of or pertaining to Satan; having the qualities of Satan; resembling Satan; extremely malicious or wicked; devilish; infernal
{s} pertaining to Satan, pertaining to Lucifer; characteristic of Satan, devilish, wicked, diabolical, demonic