If you do something superficially, you do it without looking deeply or carefully.
Doing something superficially is usually not very good. It can mean you didn't try very hard.
Examples:
He only looked at the picture superficially.
She cleaned the room superficially.
The teacher only read the paper superficially.
I just listened to the song superficially, so I didn't really understand it.
She superficially glanced at the book and didn't really read it.
He superficially studied for the test and didn't do well.