If you do something scornfully, you do it in a way that shows you think it is not important or not good.
Doing something scornfully can make other people feel bad or not important.
Examples:
She looked at him scornfully.
He spoke scornfully about her painting.
The cat watched the dog scornfully.
He laughed scornfully at the idea.
She turned away scornfully, not wanting to listen.
The teacher scornfully looked at the messy desk.