hellish

very unpleasant

• “hellish weather”
• “stop that god-awful racket”

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”