Examples of usage:

  1. " Thank you, I shall ride with my cousins," said Charles, with as much nonchalance as he could assume- and he did so; Mr. Ingoldsby, Mrs. Peters, Mr. Simpkinson from Bath, and his eldest daughter with her album, following in the family coach. "Humorous Ghost Stories" by Dorothy Scarborough
  2. He was smoking a cigarette with a too obvious nonchalance to deceive. "Patricia Brent, Spinster" by Herbert Jenkins
  3. He was staring at the gray seal on the table top in front of him, and now in spite of his effort to maintain nonchalance, a whiteness had come into his face. "The Further Adventures of Jimmie Dale" by Frank L. Packard

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