/ ˈmɒŋkeɪ; NAmE mɑːŋˈkeɪ/ adjective
(following nouns) (from French , formal or humorous ) used to describe a person who hoped to follow a particular career but who failed in it or never tried it :
He's really an artist manqué.
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WORD ORIGIN
late 18th cent.: French , past participle of manquer to lack.