Cruel, barbaric (7)
I believe the answer is:
inhuman
This clue is a double definition.
'cruel' is the first definition.
(inhuman can mean cruel or inhumane)
'barbaric' is the second definition.
(I've seen this before)
(Other definitions for inhuman that I've seen before include "Savage, brutal" , "Cruel, barbaric" , "barbarous and brutal" , "Without compunction" , "Nasty" .)