Amoral (12)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
unscrupulous
'amoral' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for unscrupulous that I've seen before include "Unprincipled" , "Devoid of moral principles" , "Unethical" , "Without principles" , "Ruthless" .)