One of the mysteries of the English language finally explained.
A woman of refined or decorous manners and character; (also) a fashionable woman. Also (ironic or depreciative): a woman who dresses ostentatiously, affects manners viewed as being above her social rank or position, or is preoccupied with her appearance.
Late 16th century; earliest use found in Barnabe Googe (1540–1594), poet and translator. From fine + lady.
fine lady/ˌfʌɪn ˈleɪdi/
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