fiendishly

/ˈfindɪʃli/
adverb
  1. In a cruel or evil manner.
    • The villain grinned fiendishly as he revealed his plan.
    • She laughed fiendishly at her opponent's misfortune.
    • The dictator ruled fiendishly, showing no mercy.
  2. In a very clever but tricky or unpleasant way.
    • He fiendishly manipulated the data to make himself look good.
    • The trap was fiendishly designed to catch anyone who entered.
    • The plot of the novel was fiendishly complex.
  3. Extremely; used to emphasize how difficult or intense something is.
    • The puzzle was fiendishly complicated.
    • The weather turned fiendishly cold overnight.
    • The math problem was fiendishly hard.
Antonyms
What does "fiendishly" mean? | whatsthatwordmean | whatsthatwordmean