insolent, effronté
More impertinent?
Plus impertinent ?
— The Irony of Fate, or Enjoy Your Bath! (1976)
How impertinent!
Quelle impertinence !
How very impertinent!
Quelle insolence !
Don't be impertinent.
Ne sois pas impertinent.
You are asking too much, impertinent.
Vous en demandez trop, impertinent.
— The Wages of Fear (1953)