Diabolical (7)
'diabolical' is the definition.
(I know that diabolical can be written as fiendish)
This is all the clue.
(Other definitions for fiendish that I've seen before include "Finished (anag) - demonic" , "This Sudoku" , "like some Sudokus" , "Extremely cruel" , "Diabolic" .)
'diabolical' is the definition.
(I know that diabolical can be written as demonic)
This is the entire clue.
(Other definitions for demonic that I've seen before include "Inspired as if by a fiend" , "As if possessed by devil" , "Like a devil or evil spirit" , "Wicked" , "Devilish" .)
'diabolical' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for evil that I've seen before include "Maleficent" , "heinous" , "Live (anag.)" , "Nefarious" , "source of harm" .)