fiendish

About 0.28 uses per million words.

Meaning

1. adjective Sinister; evil; like a fiend.

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

2. adjective Very difficult.

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

Similar words

diabolic demonic satanic infernal wicked diabolical unholy evil hellish demoniacal

Often followed by

delight cruelty and glee ingenuity laugh plot work in

Word family

fiendishly fiendishness fiendishnesses