Pertaining to the devil; resembling, or appropriate, or appropriate to, the devil; devilish; infernal; impious; atrocious; nefarious; outrageously wicked; as, a diabolic or diabolical temper or act.
source: Webster 1913
adjective satellite
showing the cunning or ingenuity or wickedness typical of a devil
Devilish schemes. The cold calculation and diabolic art of some statesmen. The diabolical expression on his face. A mephistophelian glint in his eye.
source: WordNet 3.0
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.
