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1. Insolent or impertinent behavior
2. A daring or audacious attitude that is often offensive
1. Loki's effrontery in challenging Thor to a duel surprised all of Asgard.
2. The Riddler had the effrontery to leave a riddle at the scene of the crime, mocking Batman.
3. Despite getting caught red-handed, Shinchan had the effrontery to lie to his mother about eating all the cookies.
4. Han Solo displayed remarkable effrontery when he bragged about the Millennium Falcon's speed to the skeptical patrons of the Mos Eisley Cantina.