He's talking quietly.

He's running quickly.

He's walking slowly.

He's playing the piano well.

It's playing the piano badly.

He's carrying boxes badly.

He's carrying boxes carefully.

She's working slowly.

He's working quickly.

It's eating quietly.

It's eating loudly.

He's riding a bike well.

He's riding a bike badly.

She's reading quickly.

She's reading carefully.