Contemptible or mean (10)
I believe the answer is:
despicable
I believe this clue is a double definition.
'contemptible' is the first definition.
(similar in meaning)
'mean' is the second definition.
(I've seen this before)
(Other definitions for despicable that I've seen before include "Vile" , "rotten" , "bum" , "Mean" .)