Abominable (7)
'abominable' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for heinous that I've seen before include "Wicked (offence)" , "Loathsome" , "Diabolic" , "Awful" , "Extremely wicked" .)
'abominable' is the definition.
(I know that abominable can be written as atrocious)
This is the entire clue.
(Other definitions for atrocious that I've seen before include "Appalling" , "Terrible" , "Awful" , "Extremely bad" , "Horrifyingly wicked" .)