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fiendish +‎ -ly.



fiendishly (comparative more fiendishly, superlative most fiendishly)

  1. In a fiendish manner; evilly, wickedly.
  2. Extremely, very.
    • 2009, Jeremy Duns, Free Agent, London: Simon & Schuster UK, →ISBN, page 78:
      Either the Russians are so fiendishly clever that they've managed to keep one of their agents running in this organization for over twenty years or they're so fiendishly clever that they're sending us false defectors to claim that they have.
    • 2015, Samer Nashef, The Naked Surgeon: The Power and Peril of Transparency in Medicine, Melbourne, Vic.: Scribe, →ISBN:
      In this operation, veins or arteries are taken from various body parts and used to bypass blockages or narrowings in the coronary arteries, those fine, fiddly, yet fiendishly important vital suppliers to the heart muscle itself.
    • 2017 October 27, Alex McLevy, “Making a Killing: The Brief Life and Bloody Death of the Post-Scream Slasher Revival”, in The A.V. Club[1], archived from the original on 5 March 2018:
      Balancing horror and comedy is fiendishly difficult. The two rarely work well together, which is why the successes become so lauded (Evil Dead 2, An American Werewolf In London, Dead Alive).


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