from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Unfulfilled or frustrated in the realization of one's ambitions or capabilities: an artist manqué; a writer manqué.
French, from past participle of manquer, to fail, from Old French, from Old Italian mancare, from manco, lacking, from Latin mancus, maimed, infirm; see man-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)