The smooth manner of the spy, curiously in dissonance with his ostentatiously rough dress, and probably with his usual demeanour, received such a check from the inscrutability of Carton,—who was a mystery to wiser and honester men than he,—that it faltered here and failed him.
There are no more uses of "dissonance" in the book.
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I find the dissonance in her music disturbing.
She was especially excited to learn about the famous experiments in cognitive dissonance.