By some diabolical unseemly chance the case was brought into court.
Why should he know that diabolical good and evil when it costs so much?
On one point they will show diabolical cunning, while another will escape them altogether.
Ah, he likes being always surrounded with company, and he likes to tell his companions everything, even his most diabolical and dangerous ideas; he likes to share every thought with others, and expects, for some reason, that those he confides in will meet him with perfect sympathy, enter into all his troubles and anxieties, take his part and not oppose him in anything.
There are no more uses of "diabolical" in the book.
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As part of her diabolical plan, she spent the first year gaining their trust.
She was frightened by the diabolical expression on his face.