fiendish
adjective
diabolically cruel and wicked.
fiendishly
-
a word derived from
fiendish.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
But he knew the significance of the mile, a distance more relatable to a broad audience than, say, the marathon—and yet, fiendishly difficult to run quickly.
From The Wall Street Journal ● Jul. 22, 2026
Mays’ portrayal — I can’t imagine anyone topping his interpretation of the character — is fiendishly complex.
From Los Angeles Times ● Feb. 18, 2026
One of the paradoxes of songwriting is that it can be fiendishly difficult to craft something that sounds effortlessly simple.
From The Wall Street Journal ● Oct. 29, 2025
After “The Dark Knight,” the Marvel Cinematic Universe slowly, fiendishly consumed the superhero genre, making it the superhero industrial complex.
From Salon ● Jul. 13, 2025
They were not large or fierce, like the bears and tigers that roamed the mountains, but they were known to be fiendishly clever.
From "A Single Shard" by Linda Sue Park
