fiendish

Meanings

1. 1
   adj

   Sinister; evil; like a fiend.

   The detective was puzzled by the fiendish plot to steal the diamonds.

2. 2
   adj

   Very difficult.

   The exam was filled with fiendish questions that made no sense.

3. 3
   adj

   extremely evil or cruel

Etymology

From fiend + -ish.