Savage, unfeeling (6)
I believe the answer is:
brutal
This clue is a double definition.
'savage' is the first definition.
(synonyms)
'unfeeling' is the second definition.
(thesaurus)
(Other definitions for brutal that I've seen before include "Very cruel, merciless" , "Savagely violent" , "Cruel, heartless" , "extremely honest" , "Cruel and unfeeling like an animal" .)