Definition of "fiendish" in Englisch

adjective

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