One was the flippant contempt with which the guests evidently regarded her uncle, and the other, the easy insolence of their manner towards herself.
There are no more uses of "flippant" in the book.
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Her response is entertaining, but the question deserves a less flippant answer.
Despite what those flippant "I’m a Mac/PC" ads would have you believe, Microsoft is not a shlub in a bad blazer and pleated khakis: it’s still the world’s largest software company and a force to be reckoned with.