This video is unavailable. Sentence example with the word 'diabolical' diabolical animal, beastly, brutal, cruel, demoniacal, devilish, ferocious, hellborn, murderous, sanguineous, subhuman, unhuman Definition adj. Wiki User 2008-11-21 06:53:08. drinking water. It was a truly diabolic fire that spread with lightening speed, jumped from one object to the next, and consumed the whole building in a matter of minutes, soaring sky high into the night. Watch Queue Queue. Example sentences for: diabolic How can you use “diabolic” in a sentence? showing the cunning or ingenuity or wickedness typical of a devil Last update: June 9, 2015 The police discovered a diabolical plan to poison the city's. Watch Queue Queue What is an example of diabolical in a sentence? Related Questions. Here are some example sentences to help you improve your vocabulary: While Clinton couldn't be sure of destroying Saddam's "diabolic arsenal," Lambroschini said, he could be "virtually certain of unleashing a wave of anti-American and pro-Islamic feeling in the Middle East." diabolical definition: The definition of diabolical is something devilish or cunning in an evil way.