What is the origin of obscurantism?
English obscurantism ultimately comes via the French noun obscurantisme from Latin obscūrant-, the stem of obscūrāns, present participle of obscūrāre “to dim, cover in darkness,” a derivative of the adjective obscūrus “dim, dark, dingy; insignificant, doubtful,” the obvious source of English obscure. Obscūrus is a compound of the preposition and prefix ob, ob- “to, toward, in front of“ (and in compounds usually having a sense of confrontation or opposition), and the unattested adjective scūrus. Scūrus is a Latin development of the Proto-Indo-European root (s)keu-, (s)kū- “to hide, cover.” The Germanic form of this root, skeu-, has a derivative noun skeujam “cloud, cloud cover” that becomes skȳ in Old Norse, adopted into English as sky. Obscurantism entered English in the 19th century.