adjective. Not admitting of moral distinctions or judgments; neither moral nor immoral.

adjective. Lacking moral sensibility; not caring about right and wrong.

Devoid of moral quality; neither moral nor immoral; non-moral.

adjective. being neither moral nor immoral

adjective. not believing in or caring for morality and immorality

"Would-be oppressors have historically recruited whatever argument (s) are at hand to justify atrocity, whether based on the in-group's supposed superiority, the victim's supposed moral failings, supposed divine preferences, or plain amoral arbitrariness."