My father told me that sometimes diabolical people are very creative and smart.
his diabolical and cunning ways
"Advertising men and politicians are dangerous if they are separated - together they are diabolical." (Phillip Adams, writer)
The police discovered a diabolical plan to poison the city's drinking water.
Yes. There is no word or phrase in English that cannot begin a sentence. "Diabolical influence informs most attempts to correct the behavior of other people."It depends.Like if you have a paragraph...