Vile, horrible (4)
I believe the answer is:
evil
I believe this is a double definition.
'vile' is the first definition.
(I've seen this in another clue)
'horrible' is the second definition.
(thesaurus)
(Other definitions for evil that I've seen before include "Depravity, wickedness" , "Wicked or immoral" , "Maleficent" , "Malignant" , "Great wickedness" .)