Unimpressed (5)
I believe the answer is:
blase
'unimpressed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for blase that I've seen before include "Jaded" , "Unimpressed, offhand" , "Having a "seen it all before" attitude" , "Surfeited with pleasure" , "Showing indifference through overfamiliarity" .)