nihilist

One who believes in nothing; one who advocates the metaphysical doctrine of nihilism.

One who rejects all the positive beliefs upon which existing society and governments are founded; one who demands the abolition of the existing social and political order of things.

Specifically An adherent of nihilism; a member of a Russian secret society which aims at the overthrow of the existing order of things, social, political, and religious; a Russian anarchist or revolutionary reformer. See nihilism, 4.

One who advocates the doctrine of nihilism; one who believes or teaches that nothing can be known, or asserted to exist.

A member of a secret association (esp. in Russia), which is devoted to the destruction of the present political, religious, and social institutions.