Loathe or detest (5)
I believe the answer is:
abhor
I believe this is a double definition.
'loathe' is the first definition.
(synonyms)
'detest' is the second definition.
(abhorring is a kind of detesting)
(Other definitions for abhor that I've seen before include "Find disgusting" , "cannot stand" , "Detest, hate" , "Sea between Africa and Australia" , "Recoil from" .)