Horrifying or sensational (5)
I believe the answer is:
lurid
I believe this is a double definition.
'horrifying' is the first definition.
(thesaurus)
'sensational' is the second definition.
(similar in meaning)
(Other definitions for lurid that I've seen before include "Vivid, sensational" , "Sensational; colourful" , "Gloomily threatening" , "Glaring in colour, shockingly vivid" , "Awfully bright" .)