She opened her eyes and stared at him, to see that he was laughing silently to himself.

I laughed silently and slapped her a very quiet high five.

I asked, for our new acquaintance was laughing silently to himself.

Sitting there on his bed, he laughed silently to himself.

He put back his head and laughed silently in the darkness.

The man laughed silently, throwing his head back like a wolf.

She noticed her foster brother standing to one side and silently laughing.

He looked around at the old man and saw him laughing silently.

The one who'd been doing the talking was laughing silently.

I laughed at him silently, and he answered me in much the same way.