Obscurantism (/ɒbˈskjʊərənˌtɪzəm, əb-/ and /ˌɒbskjʊˈræntɪzəm/) is the practice of deliberately preventing the facts of some subject matter from becoming known. There are two, historical and intellectual denotations to Obscurantism: (1) the deliberate restriction of knowledge—opposition to disseminating knowledge; and, (2) deliberate obscurity—an abstruse style (as in literature and art) characterized by deliberate vagueness. Therefore, an obscurantist is someone who actively opposes enlightenment and the consequent social reform, a type of anti-intellectual. The term obscurantism derives from the title of the 16th-century satire Epistolæ Obscurorum Virorum (1515–19, Letters of Obscure Men), that was based upon the intellectual dispute between the German humanist Johann Reuchlin and the monk Johannes Pfefferkorn of the Dominican Order, about whether or not all Jewish books should be burned as un-Christian heresy. Earlier, in 1509, the monk Pfefferkorn had obtained permission from Maximilian I, Holy Roman Emperor (1486–1519), to burn all copies of the Talmud (Jewish law and Jewish ethics) known to be in the Holy Roman Empire (AD 926–1806); the Letters of Obscure Men satirized the Dominican arguments for burning "un–Christian" works. In the 18th century, Enlightenment philosophers applied the term obscurantist to any enemy of intellectual enlightenment and the liberal diffusion of knowledge. In the 19th century, in distinguishing the varieties of obscurantism found in metaphysics and theology from the "more subtle" obscurantism of the critical philosophy of Immanuel Kant, and of modern philosophical skepticism, Friedrich Nietzsche said: "The essential element in the black art of obscurantism is not that it wants to darken individual understanding, but that it wants to blacken our picture of the world, and darken our idea of existence."

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