Agile : a person / animal who
can move easily or quickly.
or
a person
who is clever to understand things quickly.
e.g.: My best friend is very agile.
Impertinent: somebody not showing respect to his elders
e.g.: he is very impertinent.
Astute: Somebody showing that he is very sharp / a
sharp person.
e.g: he
won the chess championship. He is very astute.
