Downright repulsive (4)
I believe the answer is:
rank
I believe this is a double definition.
'downright' is the first definition.
(I know that downright can be written as rank)
'repulsive' is the second definition.
(thesaurus)
(Other definitions for rank that I've seen before include "Level; smelling bad" , "Violent old-fashioned" , "Very undesirable" , "High standing; foully smelling" , "Coarse; tier" .)