BLANK-VERSE, n. Unrhymed iambic pentameters -- the most difficult kind of English verse to write acceptably; a kind, therefore, much affected by those who cannot acceptably write any kind.
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.