devilish
/ˈdɛvəlɪʃ/ adverb C2- Devilishly; very; exceedingly. · It was devilish hot outside today.
From the library
If the child were pricked with one of those arrows dipped in curare or some other devilish drug, it would mean death if the venom were not sucked out.
I must say, Watson, that there is a certain devilish ingenuity about it, even if the queer name of the tenant did give him an opening which he could hardly have expected.
There’s the devilish cunning of it!
You perceive the devilish cunning of it, for really it would be almost impossible to make a case against the real murderer.
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