fiendish
UK /ˈfiːndɪʃ/ US /ˈfiːndɪʃ/
adj 2
Definitions
adj
1
Sinister; evil; like a fiend.
The detective was puzzled by the fiendish plot to steal the diamonds.
She had a fiendish smile that hinted at a cunning plan.
2
Very difficult.
The exam was filled with fiendish questions that made no sense.
a fiendish crossword puzzle
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