noun
shameless boldness or impudence
adjective
effronterous
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The defendant's effrontery in denying any involvement in the crime was astounding.
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I can't believe the effrontery of that guy to ask for a raise after just starting the job.
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Her effrontery in cutting in line at the store was so rude.
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The politician's effrontery in twisting the truth to fit his narrative was truly shameless.