All 3 Uses

impudent
in
The Apology, by Plato
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I cannot help thinking, men of Athens, that Meletus is reckless and impudent, and that he has written this indictment in a spirit of mere wantonness and youthful bravado.†
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If I had gained anything, or if my exhortations had been paid, there would have been some sense in my doing so; but now, as you will perceive, not even the impudence of my accusers dares to say that I have ever exacted or sought pay of any one; of that they have no witness.†
But I had not the boldness or impudence or inclination to address you as you would have liked me to do, weeping and wailing and lamenting, and saying and doing many things which you have been accustomed to hear from others, and which, as I maintain, are unworthy of me.†

Definitions:

(1) (impudent)
improperly bold or disrespectful -- especially toward someone who is older or considered to be of higher status
(2) (meaning too rare to warrant focus)