: the most powerful spirit of evil in Christianity, Judaism, and Islam who is often represented as the ruler of hell
informal
1
—used to make a statement or question more forceful
What the devil are you talking about?
Where the devil have you been?
2
: something that is very difficult or that causes a lot of trouble
The shoes look great, but they're the devil to walk in.
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Merriam-Webster unabridged
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