if you are amused by something, you think it is funny and you smile or laugh
Ellen seemed amused by the whole situation.
I could see she was highly amused (=very amused).
The man looked a little amused.
He won't be very amused (=he will be annoyed) when he finds out what's happened to his garden.
to entertain or interest someone for a long time so that they do not get bored:
There were puzzles and games to keep the children amused.