Always mature for her age, she had gained a certain aplomb in both carriage and conversation,
Louisa May Alcott. Little Women (1869)
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It was not difficult to probe the reason for his loss of aplomb.
P. G. Wodehouse. The Girl in Blue, p.1 (1971)
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"[...] And so I name, with insouciant aplomb, Turgenev and Trollope and Goethe, but so as not to be too indebted to dead white males because that would be a little too unoriginal, I added Selma Lagerlöf. And suddenly they don't know what to ask me, because I'd thrown the script out the window."