lugubrious

Pronunciation: loo-goo-bree-uhs (listen to it on m-w.com)

Adjective: mournful, gloomy, especially affected in an exaggerated manner; dismal.

Etymology: Late 16th century. From the Latin lugere (mourn; lament)

Usage: Lots of results for it in Google Books search, including this lovely example from The Alhambra by Washington Irving.