| a. | 1. | Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish. |
| Adj. | 1. | fiendish - 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" |