Pronunciation: /ˈfiːndɪʃ/
adjective extremely cruel or devilish; diabolical
A1 The fiendish villain was finally captured by the brave hero.
A2 The fiendish puzzle was difficult to solve, but we managed to figure it out.
B1 The fiendish plan to sabotage the event was foiled by quick thinking organizers.
B2 The fiendish plot to overthrow the government was uncovered by intelligence agencies.
C1 The fiendish mastermind behind the criminal organization was finally brought to justice.
C2 The fiendish scheme to manipulate the stock market was exposed by investigative journalists.
formal The detective was baffled by the fiendish plot devised by the criminal mastermind.
informal That escape room had some seriously fiendish puzzles that had us stumped for hours.
slang I can't believe you beat that fiendish level in the game, you're a pro!
figurative Her smile was fiendish as she plotted her revenge against her ex-boyfriend.
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