fiendish
[ˈfindɪʃ]
adj.
残酷的;
刁钻的;
非常不愉快的;
（困难、机敏等）非常的;
adv.
残酷地;
凶猛地;
刁钻地;
n.
棘手;
例句:
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A rather neat option allows you to design your own fiendish puzzle.
只要干净利落地做一个选择，你就能自己设计出难以解开的谜题。
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One is planning soon to tackle a fiendish Hebridean strait.
来自THETIMES
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Was this a fiendish joke or a sadistic gambit?
来自NEWYORKER
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This was a fiendish act of wickedness.
这是极其恶毒的行为。
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shrieks of fiendish laughter
恶魔般的尖笑声
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Invisibility adds a fiendish element to hide-and-seek games at children's parties.
来自THETIMES