Can't stand; can't abide (6)
I believe the answer is:
loathe
I believe this is a double definition.
'can't stand' is the first definition.
(I've seen this before)
'can't abide' is the second definition.
(I've seen this before)
(Other definitions for loathe that I've seen before include "Find repugnant" , "Feel hatred for" , "Feel intense dislike or disgust for" , "Cordially dislike, despise" , "Dislike intensely" .)