Lasslorn

[…] thy broome-groues; Whose shadow the dismissed Batchelor loues, Being lasse-lorne:

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1845, George M. Horton, “To Miss Tempe” in The Poetical Works of George M. Horton, Hillsborough, North Carolina: D. Heartt, p. 91, Bless’d hope, when Tempe takes her last long flight, And leaves her lass-lorn lover to complain, Like Luna mantling o’er the brow of night, Thy glowing wing dispels the gloom of pain.

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I suspect Lord Hervey to have been a handsome man, and a favourite with the ladies—perhaps a beau garçon;—keen aggravations of an offence in the eyes of the ugly, the diminutive, the lass-lorn, and the unfashionable.

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“Don’t be absurd, Steve! And for Heaven’s sake don’t look so lackadaisical and lasslorn.”

Source: wiktionary