fiendish

Adjective
  1. Extremely evil or cruel;
    Expressive of cruelty or befitting hell (synset 301136015)
    "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"
    similar to: evil - morally bad or wrong
    same as: demonic, diabolic, diabolical, hellish, infernal, satanic, unholy

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