Heartless, uncaring (7)
I believe the answer is:
callous
This clue is a double definition.
'heartless' is the first definition.
(I've seen this before)
'uncaring' is the second definition.
(thesaurus)
(Other definitions for callous that I've seen before include "Heartless" , "Cruel and unfeeling" , "Cruel or unsympathetic" , "Hard and unfeeling" , "Not feeling" .)