Moral nihilism
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Moral nihilism, or ethical nihilism is a philosophical view that nothing is either moral or immoral. For example, a moral nihilist would say that killing someone, for whatever reason, is neither right nor wrong.
Moral nihilism is distinct from moral relativism, which does allow for moral statements to be true or false in a non-absolute sense, but does not assign any permanent truth-values to these statements.
Moral nihilism has usually been considered to fall into two forms: moral noncognitivism (which says moral statements aren't true or false to begin with), and error theory (a view claiming they attempt to be true, but fail).