One who practises or who advocates amoralism.(noun)
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Use "amoralist" in a sentence
"One is the judge, an urbane amoralist like Jones in Conrad's novel, who is to preside over the registration of indigenous people to vote in a forthcoming election."
"I could be an atheist and an amoralist, but I still calculate that doing business with a churchgoer is to my advantage."
"More complex versions of non-cognitivism can make the connection with actual motivation looser and thereby withstand the amoralist challenge."