Denis Eady was the son of Michael Eady, the ambitious Irish grocer, whose suppleness and effrontery had given Starkfield its first notion of "smart" business methods, and whose new brick store testified to the success of the attempt.
There are no more uses of "effrontery" in the book.
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She had the effrontery to laugh at the mayor’s request.
Armed with too much confidence and effrontery, she made a lot of enemies.