Nihilism is the view that life has no built-in meaning, or that moral claims have no foundation outside human invention. The word covers two separate claims that are easy to run together.

Two claims, not one

Existential nihilism says life has no purpose given to it from outside — no plan it is fulfilling, no point written into it in advance.

Moral nihilism says moral statements are not true of anything. On this view, "cruelty is wrong" reports an attitude or a convention rather than a fact about the world.

These do not imply each other, and confusing them causes most of the muddle around the word. You can hold that values are human inventions and still hold that a life can go well or badly — inventions can be good ones. Equally, you can find life meaningful and have no account of what makes cruelty wrong.

The first claim produces a personal crisis. The second is a technical question about what moral language does, argued in a literature that rarely mentions the first.

Nietzsche's version

Friedrich Nietzsche used the word for a historical condition rather than a philosophical position — something that happens to a culture rather than something anyone argues for.

His claim was that Europe's highest values had undermined themselves. The demand for truthfulness was itself a value the religious tradition had cultivated, and applied consistently it eventually turned on the tradition that produced it. The framework collapsed by its own standards, from the inside, and what remains is the condition he called nihilism.

He treated this as a passage rather than a destination. The danger he named was passive nihilism — the shrug, the conclusion that since nothing is given, nothing is worth doing. The alternative he proposed was creating values deliberately, in full awareness that they are created.

Why it is not the end of the argument

If no meaning is supplied in advance, the question of what to do about that is still open.

Existentialism takes the same premise and concludes that meaning has to be made and owned. Camus called the gap between our demand for meaning and a silent universe the absurd, and argued for living in full view of it without pretending it has been resolved.

Nihilism is the starting condition those positions answer.