pompous (speech or writing) adj.: fustian

[New Yorker Magazine editor Robert Gottlieb was] anxious to rid The New Yorker of its fustian ways, including such standard issue New Yorker language as “We betook ourselves.” (Mary Vespa, Picks & Pans: Pages, People, 10/10/1988, p. 42.)

This word, when used in the above sense, can also be a synonym for affected, bombastic, ostentatious, pretentious, or showy.