Definitions for: Fiendish

[adj] 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"

Webster (1913) Definition: Fiend"ish, a.
Like a fiend; diabolically wicked or cruel; infernal;
malignant; devilish; hellish. -- Fiend"ish*ly, adv. --
Fiend"ish*ness, n.

Synonyms: demonic, diabolic, diabolical, evil, hellish, infernal, satanic, unholy, wicked

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