Villona played a waltz for Farley and Riviere, Farley acting as cavalier and Riviere as lady.
She had been made awkward by her not wishing to receive the news in too cavalier a fashion or to seem to have connived and Polly had been made awkward not merely because allusions of that kind always made her awkward but also because she did not wish it to be thought that in her wise innocence she had divined the intention behind her mother’s tolerance.
There are no more uses of "cavalier" in the book.
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I always knew her cavalier attitude toward the law would get her in trouble.