Demonic (7)
'demonic' is the definition.
(synonyms)
This is all the clue.
(Other definitions for satanic that I've seen before include "Nick's" , "Like hell it is" , "like Mephisto" , "Fiendish" , "Like the Devil" .)
'demonic' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for evil that I've seen before include "source of harm" , "mischief" , "no good in this puzzle" , "Morally bad" , "Morally reprehensible" .)
'demonic' is the definition.
(synonyms)
This is all the clue.
(Other definitions for fiendish that I've seen before include "Very difficult" , "This Sudoku" , "Terrible" , "Infernal" , "very hard" .)