MISCREANT, n. A person of the highest degree of unworth. Etymologically, the word means unbeliever, and its present signification may be regarded as theology's noblest contribution to the development of our language.
Source: The Devil's Dictionary, 1911.
-- Ambrose Bierce, (Jun 24 1842-1914), US journalist, short-story writer; He was a noted wit, satirist and sardonic short story writer who disappeared while covering the Mexican revolution.