Blasé (5)
I believe the answer is:
jaded
'blase' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for jaded that I've seen before include "Tired and bored, lacking zest" , "Very tired or fed up" , "Very tired or bored stiff" , "Weary from excess" , "Worn out or bored" .)