#1 fiendish s. [demonic, diabolic, diabolical, hellish, infernal, satanic, unholy] 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"; "in. wn
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