The impudent children would not stop talking in class.
Origin of impudent
Middle English from Latin impudēnsimpudent-in-notin–1pudēnspresent participle ofpudēreto be ashamed
"He is the most impudent and opiniative fellow I ever knew," said Wolfe Tone.
"Impudent fellows!" said the prince.
"Don't be impudent, Eureka," admonished Dorothy.
Macpherson, whose Fingal had been treated in the Journey as an impudent forgery, threatened to take vengeance with a cane.
The discovery that the poet had printed secretly 1500 copies of The Patriot King caused him to publish a correct version in 1749, and stirred up a further altercation with Warburton, who defended his friend against Bolingbroke's bitter aspersions, the latter, whose conduct was generally reprehended, publishing a Familiar Epistle to the most Impudent Man Living.