fiendish
fiend|ish /f'iːndɪʃ/
1 [ADJ] usu ADJ n
A fiendish plan, action, or device is very clever or imaginative. (INFORMAL)
...a fiendish plot.
= devilish
● fiendishly [ADV] usu ADV adj
This figure is reached by a fiendishly clever equation.
2 [ADJ] ADJ n
A fiendish problem or task is very difficult and challenging. (INFORMAL)
...the fiendish difficulty of the questions.
● fiendishly [ADV] ADV adj
America's trade laws are fiendishly complex.
3 [ADJ] usu ADJ n
A fiendish person enjoys being cruel.
This was a fiendish act of wickedness.
1 [ADJ] usu ADJ n
A fiendish plan, action, or device is very clever or imaginative. (INFORMAL)
...a fiendish plot.
= devilish
● fiendishly [ADV] usu ADV adj
This figure is reached by a fiendishly clever equation.
2 [ADJ] ADJ n
A fiendish problem or task is very difficult and challenging. (INFORMAL)
...the fiendish difficulty of the questions.
● fiendishly [ADV] ADV adj
America's trade laws are fiendishly complex.
3 [ADJ] usu ADJ n
A fiendish person enjoys being cruel.
This was a fiendish act of wickedness.