Question

Unlike the his well behaved brother, Alec was an impertinent child who constantly asked rude and intrusive questions of authority figures

Answer 1

Explanation: in this case, the context provides a clue by contrast with the underlined word. the word unlike suggests a contrast with well behaved implying the word impertinent means (ill-mannered)

from edmentum

Answer 2

Wht is dis ???
Wht do u wanna know ??