EnglishMain Dictionary
fiendish
Universal Words
adjective [usuallybeforenoun]
1 cruel and unpleasant:
a fiendish act / grin * shrieks of fiendish laughter
2 (informal) extremely clever and complicated, often in an unpleasant way:
a puzzle of fiendish complexity * a fiendish plan
3 (informal) extremely difficult:
a fiendish problem
