Disdainful, contemptuous (8)
I believe the answer is:
scornful
I believe this clue is a double definition.
'disdainful' is the first definition.
(I know that disdainful can be written as scornful)
'contemptuous' is the second definition.
(I know that contemptuous can be written as scornful)
(Other definitions for scornful that I've seen before include "Openly contemptuous" , "Dismissive, contemptuous" , "Contemptuous or derisory" , "Mocking" , "Expressing extreme contempt" .)