Amoralism, also known as Moral nihilism denies the existence of morals. It is essentially saying that morality is a fiction. Amoralists believe that there are no moral facts, nothing is right or wrong, nothing is morally good or bad, and that moral language is infected with massive false presuppositions.
It is based on the Error theory of John Mackie. Amoralism is not an ethical theory. It is a meta-ethical theory, which means it is a theory about the status of ethics. Amoralism denies morality because there is no logical connection between metaphysics and ethics.
Instead of using moral language, amoralists propose some Practical alternatives to morality. Some amoralists believe that it is okay to use moral language to help us achieve our ends. Others, like Richard Garner advocates for a total rejection of moral language.
Garner, R. (2014). Beyond Morality. Echo Point Books & Media.