Fiendish

//ˈfiːndɪʃ// adj

Definitions

Adjective
  1. 1
    Sinister; evil; like a fiend.

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

  2. 2
    Very difficult.

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

Adjective
  1. 1
    extremely evil or cruel; expressive of cruelty or befitting hell wordnet

Etymology

From fiend + -ish.

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