He has an 'impressive' vocabulary for a 10-year-old.
a large and 'impressive' [='imposing'] building
Her first performance was very 'impressive'.
(..) Absolutely impossible, sir. They have the new p- low-level avoidance systems. Get me the pentagon. What do you think, super baby? Interesting? Your theory's quite impressive, Luthor. Would you go to the viewing room, please? But as for the rest, it's nothing but a sick fantasy. Fantasy? No. (..)1978 Superman