Definition of "fiendishly" []

• In a fiendish manner (adverb)

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• "Four times he raised his voice, four times a cry of indignation drowned his words, and at length, seeing that he could obtain no farther hearing, he resumed his seat with an expression fiendishly malignant, and a fierce imprecation on Rome, and all that it contained."
• "What we've been looking at in all this mess is some kind of fiendishly subtle manufacturing error."
• "Sure, there's a lot of research showing that calories overall are what matters but there's also a lot of research -- and clinical experience -- that shows that high carb high sugar diets produce metabolic reactions that make it fiendishly difficult to lose weight by contributing to cravings and blood sugar fluctuations."