Synset

extremely evil or cruel; expressive of cruelty or befitting hell
<adj.all>   freq. cnt.: 4 freq. cnt.: 1 freq. cnt.: 1 freq. cnt.: 1 freq. cnt.: 1

demonic

diabolic

diabolical

fiendish

hellish

infernal

satanic

unholy

sample sentences

"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"